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Fair Value Measurements and Derivative Instruments (Reconciliation of Items Measured at Fair Value on a Recurring Basis) (Details) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period $ (755) $ (1,315)
Net gains (losses) recognized in earnings (14) 183
Purchases and issuances 150
Fair value, end of period (769) (982)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period (14) 183
Series E Preferred Embedded Redemption Option [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period 314
Net gains (losses) recognized in earnings (34) (57)
Purchases and issuances 150
Fair value, end of period 280 93
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period (34) (57)
Convertible Debt [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period (1,069) (1,315)
Net gains (losses) recognized in earnings 20 240
Purchases and issuances
Fair value, end of period (1,049) (1,075)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period $ 20 $ 240