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Summary of Significant Accounting Policies - Leases (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Option | Jun. 30, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |
Variable lease expense and short-term lease expenses |  |  | $ 4,200 |
Weighted average discount rate | 4.00% |  | 4.00% |
Lease expense | $ 6,200 | $ 5,800 | $ 11,800 | $ 11,100
Weighted average remaining lease term | 8 years 2 months 12 days |  | 8 years 2 months 12 days |
Rent paid to related parties | $ 700 | $ 1,100 | $ 2,000 | $ 2,200
Existence of option to extend |  |  | true |
Summary of lease asset and liabilities |  |  |  |
Lease right-of-use assets | 80,633 |  | $ 80,633 |
Lease Liabilities |  |  |  |
Other current liabilities | $ 13,185 |  | $ 13,185 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other Liabilities, Current |  | Other Liabilities, Current |
Long-term lease liabilities | $ 70,095 |  | $ 70,095 |
Present Value of Lease Liabilities | $ 83,280 |  | $ 83,280 |
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=77888426&loc=SL77918673-209980 + Details
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