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Fair Value Of Financial Instruments (Changes In Fair Value Measurement Of Level 3 Items) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 22,611 $ 25,841 $ 30,126 $ 26,755
Contingent interest payment for debenture (6,841) (5,534) (13,385) (10,759)
Unrealized (gain) loss on contingent interest derivative on Convertible Debentures (1,440) 4,747 (2,411) 9,058
Ending balance $ 14,330 $ 25,054 $ 14,330 $ 25,054