Leases (Supplemental Balance Sheet Information Related To Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Operating lease right-of-use assets	$ 200,417	$ 227,367
Operating lease liabilities - current portion	23,971	23,737
Operating lease liabilities - non-current portion	200,037	223,364
Total operating lease liabilities	224,008	247,101
Property plant and equipment, gross	363	374
Accumulated depreciation	(338)	(311)
Property plant and equipment, net	$ 25	$ 63
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Total property and equipment	Total property and equipment
Other current liabilities	$ 28	$ 40
Other long-term liabilities		$ 28
Total finance lease liabilities	$ 28
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Weighted-average remaining lease term - finance leases	1 year	2 years
Weighted-average remaining lease term - operating leases	11 years	11 years
Weighted-average discount rate - finance leases	5.21%	5.24%
Weighted-average discount rate - operating leases	4.55%	4.47%
Other Current Liabilities And Other Long-Term Liabilities [Member]
Total finance lease liabilities	$ 28	$ 68