Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and related benefits	$ 27,224	$ 20,705
Deferred revenue	7,547	8,911
Accrued interest	3,139	3,758
Derivative liability (Note 14)	13,259	18,730
Taxes payable excluding income tax payable	919	1,214
Other	8,031	5,296
Total accrued liabilities	$ 60,119	$ 58,614