Income Taxes - Reconciliation of Unrecognized Tax Benefits - (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Tax
Balance	$ 130,619	$ 127,085
Additions for current year tax positions	354	199
Additions for Reorganization Transactions	121,400
Reductions for prior years' tax positions: Expiration of statute of limitations	(70)	(127)
Reductions for prior years' tax positions: Other	(257)
Balance	130,646	127,157
Interest and Penalties
Balance	10,660	9,965
Additions for Reorganization Transactions	7,000
Additions for prior years' tax positions: Accrual of interest and penalties	242	71
Reductions for prior years' tax positions: Expiration of statute of limitations	(32)	(51)
Balance	10,870	9,985
Total
Balance	141,279	137,050
Additions for current year tax positions	354	199
Additions for prior years' tax positions: Accrual of interest and penalties	242	71
Reductions for prior years' tax positions: Expiration of statute of limitations	(102)	(178)
Reductions for prior years' tax positions: Other	(257)
Balance	141,516	137,142
Unrecognized tax benefits
Amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate	15,000	10,700
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	5,600
Net expense attributable to interest and penalties recorded	0	$ 0
Accrued interest and penalties attributable to uncertain tax positions and undisputed tax adjustments	12,800		$ 12,800
Accrued interest and penalties attributable to unrecognized tax benefits	$ 10,900		$ 10,700