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Summary of Significant Accounting Policies - Leases (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Option | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Variable lease expense and short-term lease expenses |  |  | $ 3,400 | $ 4,200 |
Weighted average discount rate | 4.20% |  | 4.20% |  | 3.90%
Lease expense | $ 6,900 | $ 6,200 | $ 13,400 | 11,800 |
Weighted average remaining lease term | 7 years 8 months 12 days |  | 7 years 8 months 12 days |  | 8 years 1 month 6 days
Rent paid to related parties | $ 1,600 | $ 700 | $ 2,500 | $ 2,000 |
Existence of option to extend |  |  | true |  |
Summary of lease asset and liabilities |  |  |  |  |
Lease right-of-use assets | 97,586 |  | $ 97,586 |  | $ 84,073
Lease Liabilities |  |  |  |  |
Other current liabilities | $ 16,701 |  | $ 16,701 |  | 14,016
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other Liabilities, Current |  | Other Liabilities, Current |  |
Long-term lease liabilities | $ 83,753 |  | $ 83,753 |  | 72,697
Present Value of Lease Liabilities | $ 100,454 |  | $ 100,454 |  | $ 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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