Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets - current:
Incentive compensation-other, net	$ 0	$ 6,150
Net deferred tax assets - current	0	6,150
Deferred Tax Liabilities Current [Abstract]
Derivative instruments, net	0	36,788
Deferred Tax Assets Liabilities Net Current	0	30,638
Deferred tax assets - non - current [Abstract]
Property and equipment	776,504	0
Deferred gain on sale	44,593	48,319
U.S. federal tax credit carryforwards	16,144	16,144
U. S. net operating loss carryforwards	319,673	147,336
US state net operating loss carryforward	61,919	53,654
Non U.S. net operating loss carryforwards	9,142	0
Asset retirement obligations	51,815	45,039
Incentive compensation/other, net	28,711	19,142
Deferred tax assets noncurrent before valuation allowances	1,308,501	329,634
Valuation allowance	(1,307,076)	(161,480)
Net deferred tax assets - non-current	1,425	168,154
Deferred Tax Liabilities - non current [Abstract]
Property and equipment	0	137,514
Other	1,424	0
Net non-current tax liabilities	1,424	137,514
Net non-current tax asset	1	30,640
Non-US Deferred tax liabilities - non-current
Other - Non US	$ 0	$ 992