Income Taxes - Reconciliation of Unrecognized Tax Benefits - (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Tax
Balance	$ 130,619	$ 127,085
Additions for current year tax positions	1,213	1,727
Additions for Reorganization Transactions	121,400
Reductions for prior years' tax positions: Expiration of statute of limitations	(209)	(258)
Reductions for prior years' tax positions: Other	(773)
Balance	130,850	128,554
Interest and Penalties
Balance	10,660	9,965
Additions for Reorganization Transactions	7,000	226
Additions for prior years' tax positions: Accrual of interest and penalties	760	295
Reductions for prior years' tax positions: Expiration of statute of limitations	(93)	(152)
Balance	11,327	10,334
Total
Balance	141,279	137,050
Additions for current year tax positions	1,213	1,727
Additions for Reorganization Transactions		226
Additions for prior years' tax positions: Accrual of interest and penalties	760	295
Reductions for prior years' tax positions: Expiration of statute of limitations	(302)	(410)
Reductions for prior years' tax positions: Other	(773)
Balance	142,177	138,888
Unrecognized tax benefits
Amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate	15,400	11,200
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	13,600
Unrecognized interest and penalties, reasonably possible to decrease within the next 12 months	5,800
Net expense attributable to interest and penalties recorded	0	$ 400
Accrued interest and penalties attributable to uncertain tax positions and undisputed tax adjustments	12,900		$ 12,800
Accrued interest and penalties attributable to unrecognized tax benefits	$ 11,300		$ 10,700