Income Taxes - Reconciliation of Unrecognized Tax Benefits - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax
Balance	$ 127,085	$ 5,903	$ 5,748
Additions for current year tax positions	2,727	490	680
Additions for Reorganization Transactions		121,401
Additions for prior years' tax positions: Other	1,152		97
Reductions for prior years' tax positions: Expiration of statute of limitations	(345)	(709)	(622)
Balance	130,619	127,085	5,903
Interest and Penalties
Balance	9,965	2,935	2,972
Additions for Reorganization Transactions	226	7,017
Additions for prior years' tax positions: Accrual of interest and penalties	621	301	178
Additions for prior years' tax positions: Other			25
Reductions for prior years' tax positions: Expiration of statute of limitations	(152)	(288)	(240)
Balance	10,660	9,965	2,935
Total
Balance	137,050	8,838	8,720
Additions for current year tax positions	2,727	490	680
Additions for Reorganization Transactions	226	128,418
Additions for prior years' tax positions: Accrual of interest and penalties	621	301	178
Additions for prior years' tax positions: Other	1,152		122
Reductions for prior years' tax positions: Expiration of statute of limitations	(497)	(997)	(862)
Balance	141,279	137,050	8,838
Unrecognized tax benefits
Amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate	14,900	10,600	6,600
Unrecognized tax benefits attributable to tax refund claims in State of California	93,900
Unrecognized tax benefits, reasonably possible to decrease within the next 12 months	107,600
Unrecognized interest and penalties, reasonably possible to decrease within the next 12 months	5,400
Net expense attributable to interest and penalties recorded	700	800	$ 0
Accrued interest and penalties attributable to uncertain tax positions and undisputed tax adjustments	12,800	12,100
Accrued interest and penalties attributable to unrecognized tax benefits	$ 10,700	$ 10,000