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Summary of Significant Accounting Policies - Leases (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) Option | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Variable lease expense and short-term lease expenses | $ 8,400 |  |
Weighted average discount rate | 3.90% |  |
Lease expense | $ 24,800 | $ 23,400 | $ 21,100
Weighted average remaining lease term | 8 years 1 month 6 days |  |
Rent paid to related parties | $ 3,700 | $ 4,800 | $ 4,800
Existence of option to extend | true |  |
Summary of lease asset and liabilities |  |  |
Lease right-of-use assets | $ 84,073 |  |
Lease Liabilities |  |  |
Other current liabilities | $ 14,016 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other current liabilities |  |
Long-term lease liabilities | $ 72,697 |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Long-term lease liabilities |  |
Present Value of Lease Liabilities | $ 86,713 |  |
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease term | 3 years |  |
Number of options to renew | Option | 1 |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease term | 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=77888426&loc=SL77918673-209980 + Details
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