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Summary of Significant Accounting Policies - Leases (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Option | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Variable lease expense and short-term lease expenses |  |  | $ 6,100 | $ 6,200 |
Weighted average discount rate | 4.20% |  | 4.20% |  | 3.90%
Lease expense | $ 8,000 | $ 6,500 | $ 21,400 | 18,300 |
Weighted average remaining lease term | 7 years 7 months 6 days |  | 7 years 7 months 6 days |  | 8 years 1 month 6 days
Rent paid to related parties | $ 2,000 | $ 700 | $ 4,500 | $ 2,700 |
Existence of option to extend |  |  | true |  |
Summary of lease asset and liabilities |  |  |  |  |
Lease right-of-use assets | 95,815 |  | $ 95,815 |  | $ 84,073
Operating Lease, Liability [Abstract] |  |  |  |  |
Other current liabilities | $ 16,368 |  | $ 16,368 |  | 14,016
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other Liabilities, Current |  | Other Liabilities, Current |  |
Long-term lease liabilities | $ 81,638 |  | $ 81,638 |  | 72,697
Present Value of Lease Liabilities | $ 98,006 |  | $ 98,006 |  | $ 86,713
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term | 3 years |  | 3 years |  |
Number of options to renew | Option |  |  | 1 |  |
Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term | 10 years |  | 10 years |  |

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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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