Leases (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 28,444	$ 25,304
Operating cash flows from finance leases	1,289	1,023
Financing cash flows from finance leases	4,115	1,973
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	15,160	29,427
Finance leases	$ 4,672	$ 16,998