Provision (Benefit) for Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
DTA, Federal net operating losses (NOLs)	$ 287,720	$ 141,896
DTA, NOLs for excess stock-based compensation	(9,571)	(9,606)
DTA, Oil and gas exploration and development costs	214,413	0
DTA, State NOL carryovers	18,384	15,525
DTA, Alternative minimum tax credits	2,092	2,092
DTA, Other loss carryforwards	1,215	1,294
DTA, Asset retirement obligations	22,884	26,388
DTA, Unrealized share-based compensation	9,953	9,471
DTA, Valuation Allowance	(553,283)	(11,327)
DTA, Other	6,193	4,056
Total deferred tax assets	0	179,789
Deferred tax liabilities:
DTL, Oil and gas exploration and development costs	0	(258,326)
DTL, Other	0	(1,596)
Total deferred tax liabilites	0	259,922
Net deferred tax liabilities	0	(80,133)
Net current deferred tax assets	0	6,243
Net non-current deferred tax liabilities	$ 0	$ 86,376