Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and related benefits	$ 14,671	$ 14,775
Deferred revenue	13,400	12,841
Accrued interest	4,155	4,854
Derivative liability (Note 14)	20,538	23,192
Taxes payable excluding income tax payable	9,988	8,136
Other	8,257	7,843
Total accrued liabilities	$ 71,009	$ 71,641