Right-of-Use (ROU) Assets and Lease Liabilities Right-of-Use ("ROU") Assets and Lease Liabilities - Lease Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating leases:
Lease cost	$ 33,024
Variable lease cost	4,243
Operating lease cost	37,267
Finance leases:
Amortization of ROU assets	2,650
Interest on lease liabilities	445
Finance lease cost	3,095
Total lease cost	40,362
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	26,940
Financing cash flows from finance leases	2,674
Right-of-use assets obtained in exchange for lease obligations:
Finance leases	203
Operating leases	$ 146,839
Operating Leases
Weighted average remaining lease term (years)	5 years 3 months 26 days
Weighted average discount rate	4.40%
Finance Leases
Weighted average remaining lease term (years)	3 years 3 months 4 days
Weighted average discount rate	5.20%