Quarterly report pursuant to Section 13 or 15(d)

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

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9. Fair Value Measurements - Summary of Recurring Fair Value Measurements by Level (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 3,242 $ 14,648
Liabilities (3,818) (2,121)
Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 3,242 2,081
Liabilities (3,492) (1,848)
Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities (326) (273)
Defined Benefit Plan Assets Large U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   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   1,099
Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   1,525
Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   6,281
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 3,242 2,081
Liabilities 3,492 (1,848)
Level 1 [Member] | Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 3,242 2,081
Liabilities (3,492) (1,848)
Level 1 [Member] | Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 0 0
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   0
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   0
Level 1 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   0
Level 1 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 12,567
Liabilities 0 0
Level 2 [Member] | Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities 0 0
Level 2 [Member] | Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 0 0
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   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   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   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   6,281
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities (326) (273)
Level 3 [Member] | Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities 0 0
Level 3 [Member] | Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities $ (326) (273)
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   0
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   0
Level 3 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   0
Level 3 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   $ 0