Leases (Lease Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Lease cost	$ 44,291	$ 44,107
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flows	45,348	40,083
Right-of-use assets obtained in exchange for new lease liabilities	$ 8,870	$ 32,881