Description of Business and Other Disclosures - Lease Accounting - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Leases [Line Items]
Property and equipment, net	$ 582,560			$ 42,000	$ 647,413
Right-of-use assets related to operating leases	122,474
Net adjustment recorded to equity	$ 91,792	$ 103,665	$ 121,809		$ 110,933	$ 116,912	$ 129,630	$ 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