Additional Balance Sheet Details (Accounts Payable and Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accrued interest	$ 44,201	$ 48,908
Accounts payable	32,688	30,477
Accrued lease operating expenses	30,169	37,549
Taxes payable	17,717	32,438
Accrued compensation	14,403	46,780
Accrued exploration and development costs	13,500	20,892
Other	34,037	36,153
Total	$ 186,715	$ 253,197