Description of Business and Other Disclosures - Lease Accounting - Summary of Adjustments to Components of Balance Sheet (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
Significant Accounting Policies [Line Items]
Property and equipment, net	$ 582,560			$ 42,000	$ 647,413
Right-of-use assets, net	122,474
Intangible assets, net	47,578				59,063
Accrued expenses and other current liabilities	17,065				17,871
Current portion of operating lease obligations	23,615
Operating lease obligations, less current portion	101,551
Deferred tax liabilities, net	19,899				19,929
Other long-term liabilities	19,226				95,589
Equity	$ 91,792	$ 103,665	$ 121,809		$ 110,933	$ 116,912	$ 129,630	$ 150,817	$ 171,019
ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Right-of-use assets, net				133,300
Remove Sale-Leaseback Balances [Member] | ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Property and equipment, net				42,000
Equity				28,900
Record ROU asset / Lease Liability [Member] | ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Right-of-use assets, net				135,900
Adjustments [Member] | ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Property and equipment, net				605,400
Right-of-use assets, net				133,300
Intangible assets, net				58,100
Accrued expenses and other current liabilities				16,800
Current portion of operating lease obligations				24,300
Operating lease obligations, less current portion				111,600
Deferred tax liabilities, net				25,100
Other long-term liabilities				17,000
Equity				139,800
Adjustments [Member] | Remove Sale-Leaseback Balances [Member] | ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Property and equipment, net				(42,000)
Accrued expenses and other current liabilities				(1,100)
Deferred tax liabilities, net				5,200
Other long-term liabilities				(75,000)
Equity				28,900
Adjustments [Member] | Record ROU asset / Lease Liability [Member] | ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Right-of-use assets, net				135,900
Current portion of operating lease obligations				24,300
Operating lease obligations, less current portion				111,600
Adjustments [Member] | Balance Sheet Reclasses [Member] | ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Right-of-use assets, net				(2,600)
Intangible assets, net				(1,000)
Other long-term liabilities				$ (3,600)