Income Taxes Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory U.S. federal income tax rate	$ 230,721	$ 41,503	$ (204,872)
Net Effect of state income taxes	60,814	15,538	(20,954)
Non-controlling Interest	(18,181)	0	0
Uncertain tax positions	(4,265)	27,359	1,351
Effect of spin on Federal NOL's	0	24,942	0
Accrual to tax return reconciliation	3,028	(1,147)	(4,564)
IRS and state tax examination settlements	0	0	(13,463)
Effect of change in state valuation allowance	(22,684)	(430)	18,999
Effect of change in federal valuation allowance	(18,110)	(145,772)	184,227
Other deferred adjustments	5,957	7,616	0
Effect of federal and state rate reductions	(27,429)	(131,784)	0
Effect of federal tax credits	1,208	(19,081)	0
Other	4,498	4,798	4,873
Income Tax Expense (Benefit) / Effective Rate	$ 215,557	$ (176,458)	$ (34,403)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory U.S. federal income tax rate	21.00%	35.00%	35.00%
Net Effect of state income taxes	5.60%	13.10%	3.60%
Non-controlling Interest	(1.70%)	0.00%	0.00%
Uncertain tax positions	(0.40%)	23.10%	(0.20%)
Effect of spin on Federal NOL's	0.00%	21.00%	0.00%
Accrual to tax return reconciliation	0.30%	(1.00%)	0.80%
IRS and state tax examination settlements	0.00%	0.00%	2.30%
Effect of change in state valuation allowance	(2.10%)	(0.40%)	(3.20%)
Effect of change in federal valuation allowance	(1.70%)	(122.90%)	(31.50%)
Other deferred adjustments	0.60%	6.40%	0.00%
Effect of federal and state rate reductions	(2.50%)	(111.10%)	0.00%
Effect of federal tax credits	0.10%	(16.10%)	0.00%
Other	0.40%	4.00%	(0.80%)
Income Tax Expense (Benefit) / Effective Rate	19.60%	(148.90%)	6.00%