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Leases (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Other Commitments [Line Items]    
Operating Lease, Right-of-Use Asset $ 47,875 $ 47,875
Operating Lease, Liability $ 53,875 $ 53,875
Operating Lease, Weighted Average Remaining Lease Term 7 years 8 months 12 days 7 years 8 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent 3.20% 3.20%
Operating Lease, Payments $ 5,600  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 3,600  
Operating Lease, Cost 2,765 [1] $ 5,585 [1]
Variable Lease, Cost 517 1,023
Sublease Income (306) (621)
Lease, Cost $ 2,976 $ 5,987
[1] Includes short-term lease costs, which are immaterial.