Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and related benefits	$ 21,429	$ 20,705
Deferred revenue	10,114	8,911
Accrued interest	2,998	3,758
Derivative liability (Note 14)	16,216	18,730
Taxes payable excluding income tax payable	1,941	1,214
Other	5,322	5,296
Total accrued liabilities	$ 58,020	$ 58,614