Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax (benefit) provision
Federal income tax	$ 0	$ (455)	$ (8,178)
State income tax	0	0	21
Net current income tax benefit	0	(455)	(8,157)
Deferred income tax provision (benefit)
Federal income tax	29,171	(20,457)	0
State income tax	6,361	13,221	0
Net deferred income tax benefit	35,532	(7,236)	0
Deferred income tax provision (benefit)
Federal tax (benefit) expense at statutory rate	33,441	61,543	45,447
State income tax	6,141	16,181	368
Permanent differences	(4,267)	(2,488)	(4,740)
AMT credit refundable	0	455	8,178
Tax Cuts and Jobs Act rate change	0	0	51,525
Change in federal valuation allowance	0	(80,003)	(101,917)
Change in state valuation allowance	217	(2,924)	1,139
Net deferred income tax benefit	35,532	(7,236)	0
Net current income tax benefit	0	(455)	(8,157)
Total income tax provision (benefit)	$ 35,532	$ (7,691)	$ (8,157)