Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current expense (benefit):
Federal									$ 89,471	$ 0	$ 0
State									3,103	424	111
Foreign									(66)	(158)	261
Total Current Income Tax Benefit									92,508	266	372
Deferred expense (benefit):
Federal									74,627	29,928	44,075
State									202	(185)	228
Income tax expense from continuing operations	$ (810)	$ (4,620)	$ (3,609)	$ 176,376	$ (14,307)	$ 11,864	$ 22,419	$ 10,033	$ 167,337	$ 30,009	$ 44,675