Income Taxes, Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current [Abstract]
Federal	$ (837)	$ 35,861	$ 438
State	3,782	14,329	(1,442)
Foreign	518	413	374
Total current income tax expense (benefit)	3,463	50,603	(630)
Deferred [Abstract]
Federal	313,271	(7,096)	(290,511)
State	0	0	0
Total deferred income tax benefit	313,271	(7,096)	(290,511)
Total income tax expense (benefit)	$ 316,734	$ 43,507	$ (291,141)