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Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate, percentage	17.50%	(102.70%)	18.60%	23.10%
Reclassification of AMT credit					$ 102,482,000
Total amount of uncertain tax positions	$ 31,516,000		$ 31,516,000		31,516,000
Unrecognized tax benefits that would impact effective tax rate	31,516,000		31,516,000		31,516,000
Accrued interest liability	$ 0		$ 0		$ 0

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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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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Amount of unrecognized tax benefits.

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