Description of Business and Other Disclosures - Lease Accounting - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Leases [Line Items]
Property and equipment, net	$ 602,382	$ 42,000	$ 647,413
Right-of-use assets related to operating leases	128,908
Net adjustment recorded to equity	$ 121,809		$ 110,933	$ 150,817	$ 171,019
ASU 2016-02 [Member]
Leases [Line Items]
Deferred tax assets relating to the failed sale-leasebacks		5,200
Right-of-use assets related to operating leases		133,300
Remove Sale-Leaseback Balances [Member] | ASU 2016-02 [Member]
Leases [Line Items]
Property and equipment, net		42,000
Sale-leaseback financing obligations		76,100
Deferred tax assets relating to the failed sale-leasebacks		5,200
Net adjustment recorded to equity		28,900
Record ROU asset / Lease Liability [Member] | ASU 2016-02 [Member]
Leases [Line Items]
Right-of-use assets related to operating leases		$ 135,900