Leases (Supplemental Balance Sheet Information Related To Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 220,503	$ 229,879	$ 232,319
Operating lease liabilities - current portion	22,699	20,379	$ 245,280
Operating lease liabilities - non-current portion	212,806	223,164
Total operating lease liabilities	235,505	243,543
Property plant and equipment, gross	383	370
Accumulated depreciation	(271)	(165)
Property plant and equipment, net	112	205
Other current liabilities	49	93
Other long-term liabilities	69	116
Total finance lease liabilities	$ 118	$ 209
Weighted-average remaining lease term - finance leases	3 years	3 years
Weighted-average remaining lease term - operating leases	11 years	11 years
Weighted-average discount rate - finance leases	5.27%	5.13%
Weighted-average discount rate - operating leases	4.71%	4.86%