Leases (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Lease cost	$ 11,741	$ 11,016	$ 34,434	$ 33,130
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flows	11,212	11,560	34,509	33,869
Right-of-use assets obtained in exchange for new lease liabilities	$ 31,249	$ 1,344	$ 31,098	$ 5,639