Additional Balance Sheet Details (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accrued compensation	$ 41,894	$ 46,780
Accrued lease operating expenses	28,918	37,549
Accrued interest	28,823	48,908
Accounts payable	28,301	30,477
Taxes payable	20,979	32,438
Accrued exploration and development costs	7,420	20,892
Other	43,931	36,153
Total	$ 200,266	$ 253,197