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Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Mar. 21, 2018
Income Tax Disclosure [Abstract]
Effective tax rate, percentage	(102.70%)	32.20%	23.10%	25.50%
Income tax benefit, revaluation of deferred tax assets					$ 115,291
Income tax benefit, reversal of valuation allowance for AMT credits					154,384
Financial statement benefit, NOL carryback	$ 20,000
Total amount of uncertain tax positions	39,953		$ 39,953		37,813
Unrecognized tax benefits that would impact effective tax rate	31,516		31,516		29,376
Change in unrecognized tax benefits			2,140
Accrued interest liability	814		814		$ 644
Accrued interest expense	$ 169		$ 169
Reduction of net operating loss						$ 108,651

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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