Leases (Supplemental Balance Sheet Information Related To Leases) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 217,692	$ 229,879
Operating lease liabilities - current portion	21,091	20,379
Operating lease liabilities - non-current portion	210,560	223,164
Total operating lease liabilities	231,651	243,543
Property plant and equipment, gross	366	370
Accumulated depreciation	(228)	(165)
Property plant and equipment, net	138	205
Other current liabilities	51	93
Other long-term liabilities	92	116
Total finance lease liabilities	$ 143	$ 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	5.25%	5.13%
Weighted-average discount rate - operating leases	4.78%	4.86%