Leases Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 12,997	$ 13,364
Operating cash flows related to operating leases	13,476	13,346
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 10,737	$ 6,637
Weighted-average remaining lease term	11 years	11 years
Weighted-average discount rate	3.89%	4.28%