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Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Income Tax Expense (Benefit)	$ 87,329	$ 63,851	$ 15,817
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Changes in Valuation and Qualifying Accounts
Charges Utilized	$ (113,729)	$ (21,527)	$ 0
Tax Valuation Allowance
Changes in Valuation and Qualifying Accounts
Balance at Beginning of Period	50,911	23,529	20,717
Charged (Credited) to Operations	0	0	0
Charged to Other Account	9,238	5,855	2,812
Charges Utilized	0	0	0
Balance at End of Period	$ 173,878	$ 50,911	$ 23,529

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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