Income Taxes - Deferred (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Foreign capitalized operating expenses	$ 69,804	$ 101,823
Foreign net operating losses	36,352	14,719
Equity compensation	30,752	26,095
Other	33,744	22,656
Total deferred tax assets	170,652	165,293
Valuation allowance	(87,517)	(116,541)
Total deferred tax assets, net	83,135	48,752
Deferred tax liabilities:
Depletion, depreciation and amortization related to property and equipment	(526,945)	(425,183)
Unrealized derivative gains	(584)	(92,549)
Total deferred tax liabilities	(527,529)	(517,732)
Net deferred tax liability	$ 444,394	$ 468,980