Leases (Supplemental Balance Sheet Information Related To Leases) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 213,177	$ 229,879
Operating lease liabilities - current portion	21,411	20,379
Operating lease liabilities - non-current portion	206,415	223,164
Total operating lease liabilities	227,826	243,543
Property plant and equipment, gross	371	370
Accumulated depreciation	(246)	(165)
Property plant and equipment, net	125	205
Other current liabilities	50	93
Other long-term liabilities	80	116
Total finance lease liabilities	$ 130	$ 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	5.26%	5.13%
Weighted-average discount rate - operating leases	4.78%	4.86%