Income Taxes - Reconciliation of Unrecognized Tax Benefits - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016
Tax
Balance	$ 134,312	$ 131,570	$ 130,619
Additions for current year tax positions	1,426	1,038	2,260
Additions for Reorganization Transactions				$ 121,400
Additions for prior years' tax positions: New uncertain tax positions identified		1,894
Reductions for prior years' tax positions: Expiration of statute of limitations	(143)	(190)	(280)
Reductions for prior years' tax positions: Other			(1,029)
Balance	135,595	134,312	131,570
Interest and Penalties
Balance	14,701	12,524	10,660
Additions for Reorganization Transactions	1,479	986	832	$ 7,000
Additions for prior years' tax positions: Accrual of interest and penalties	2,812	1,280	1,159
Reductions for prior years' tax positions: Expiration of statute of limitations	(66)	(89)	(127)
Balance	18,926	14,701	12,524
Total
Balance	149,013	144,094	141,279
Additions for current year tax positions	1,426	1,038	2,260
Additions for Reorganization Transactions	1,479	986	832
Additions for prior years' tax positions: New uncertain tax positions identified		1,894
Additions for prior years' tax positions: Accrual of interest and penalties	2,812	1,280	1,159
Reductions for prior years' tax positions: Expiration of statute of limitations	(209)	(279)	(407)
Reductions for prior years' tax positions: Other			(1,029)
Balance	154,521	149,013	144,094
Unrecognized tax benefits
Amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate	22,200	19,100	16,200
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	2,400
Unrecognized interest and penalties, reasonably possible to decrease within the next 12 months	900
Net expense attributable to interest and penalties recorded	4,400	2,400	$ 1,000
Accrued interest and penalties attributable to uncertain tax positions and undisputed tax adjustments	20,600	16,300
Accrued interest and penalties attributable to unrecognized tax benefits	18,900	$ 14,700
Determination of taxes benefit is currently recognized	$ 0