Basis of Presentation and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 24,362
Operating lease, liability		26,456
Derecognized existing facility financing obligation		0	$ (59,991)
Property and equipment, net reclassified			$ (120,179)
Property and equipment, net		59,696
Finance lease, liability		$ 61,886
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 25,400
Operating lease, liability	27,800
Derecognized existing facility financing obligation	60,000
Property and equipment, net reclassified	51,100
Cumulative effect of new accounting principle in period of adoption, gain recognized	9,300
Cumulative effect of new accounting principle in period of adoption, tax impact	(2,200)
Cumulative effect adjustment related to the adoption of the leasing standard	7,116
Property and equipment, net	66,700
Accounting Standards Update 2016-02 | Building
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property and equipment, net reclassified	22,100
Accounting Standards Update 2016-02 | Leasehold improvements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property and equipment, net reclassified	(22,100)
Finance lease, liability	66,700
Accumulated Deficit | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment related to the adoption of the leasing standard	$ 7,116