Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
9. Fair Value Measurements - Summary of Recurring Fair Value Measurements by Level (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 13,299,000 $ 14,648,000
Liabilities (12,523,000) (2,121,000)
Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 13,299,000 2,081,000
Liabilities (12,166,000) (1,848,000)
Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities (257,000) (273,000)
Defined Benefit Plan Assets Large U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   3,662,000
Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   1,099,000
Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   1,525,000
Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   6,281,000
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 13,299,000 2,081,000
Liabilities (12,166,000) (1,848,000)
Level 1 [Member] | Derivative Financial Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 13,299,000 2,081,000
Liabilities (12,166,000) (1,848,000)
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 12,567,000
Liabilities 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   3,662,000
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   1,099,000
Level 2 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   1,525,000
Level 2 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   6,281,000
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0
Liabilities (257,000) (273,000)
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 $ (257,000) (273,000)
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