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Fair Value Fair Value - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Assets accounted for at fair value on a non-recurring basis $ 0   $ 0    
Liabilities accounted for at fair value on a non-recurring basis 0   $ 0    
Weighted average yield (as a percentage)     13.10%   13.10%
Weighted average life (in years)     9 years 1 month   9 years 7 months
Unrealized (gain) loss on financial assets and liabilities $ 358,000 $ 0 $ 724,000 $ 0  
Financial Assets [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Unrealized (gain) loss on financial assets and liabilities     1,400,000    
Financial Liabilities [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Unrealized (gain) loss on financial assets and liabilities     $ (700,000)