Leases (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Lease cost	$ 11,016	$ 10,734	$ 33,130	$ 32,969
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flows	11,560	11,241	33,869	34,030
Right-of-use assets obtained in exchange for new lease liabilities	$ 1,344	$ 23,211	$ 5,639	$ 31,095