Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Recurring Fair Value Measurements by Level (Details)

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Fair Value Measurements - Summary of Recurring Fair Value Measurements by Level (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 1,774 $ 14,648
Liabilities (2,102) (2,121)
Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [1] 1,774 2,081
Liabilities [2] (1,868) (1,848)
Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities (234) (273) [3]
Defined Benefit Plan Assets Large U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]   3,662
Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]   1,099
Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]   1,525
Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]   6,281
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,774 2,081
Liabilities (1,868) (1,848)
Level 1 [Member] | Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [1] 1,774 2,081
Liabilities [2] $ (1,868) $ (1,848)
Level 1 [Member] | Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities [3]
Level 1 [Member] | Defined Benefit Plan Assets Large U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]  
Level 1 [Member] | Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]  
Level 1 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]  
Level 1 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]  
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 12,567
Liabilities
Level 2 [Member] | Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [1]
Liabilities [2]
Level 2 [Member] | Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities [3]
Level 2 [Member] | Defined Benefit Plan Assets Large U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]   $ 3,662
Level 2 [Member] | Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]   1,099
Level 2 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]   1,525
Level 2 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]   $ 6,281
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets
Liabilities $ (234) $ (273)
Level 3 [Member] | Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [1]
Liabilities [2]
Level 3 [Member] | Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities $ (234) $ (273) [3]
Level 3 [Member] | Defined Benefit Plan Assets Large U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]  
Level 3 [Member] | Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]  
Level 3 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]  
Level 3 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [4]  
[1] Included in other current assets in the consolidated balance sheets.
[2] Included in accrued liabilities in the consolidated balance sheets.
[3] Included in warrant liabilities at fair value in the consolidated balance sheets.
[4] Fair values of plan assets are determined annually and therefore are not included as of March 31, 2016. For further descriptions of these assets see the Company's Form 10-K for the year ended December 31, 2015.