Summary of Significant Accounting Policies - Lease Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating lease right-of-use assets	$ 86,396
Present value of lease liabilities	$ 98,857
Accounting Standards Update 2016-02
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating lease right-of-use assets		$ 80,328
Deferred rent		8,626
Present value of lease liabilities		$ 88,954

For a classified balance sheet, the cumulative difference as of the balance sheet date between the payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, within one year of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 20
-Section 25
-Paragraph 2
-Subparagraph (a)
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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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Amount of lessee's right to use underlying asset under operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
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