Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and related benefits	$ 30,685	$ 20,705
Deferred revenue	12,609	8,911
Derivative liability (Note 17)	10,625	18,730
Other	17,761	10,268
Total accrued liabilities	$ 71,680	$ 58,614