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Commitments and Contingencies - Lease Arrangements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Operating Lease, Cost $ 15,893
Variable Lease, Cost 2,598
Sublease Income 1,515
Lease, Cost 16,976
Operating Lease, Right-of-Use Asset 75,774
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 86,157
Operating Lease, Payments $ 11,305
Operating Lease, Weighted Average Remaining Lease Term 9 years 2 months
Operating Lease, Weighted Average Discount Rate, Percent 2.60%
Operating Lease, Expense - Not yet commenced $ 25,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2020 17,010
2021 12,295
2022 10,376
2023 9,647
2024 8,568
2025-2038 38,902
Discount (11,021)
Total discounted operating lease liabilities $ 85,777
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 10 years