Debt And Other Financing (Summary Of Long-Term Debt) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt		$ 807,565	$ 814,952
Current portion of long-term debt		(8,703)	(8,871)
Long-term debt, less current portion		798,862	806,081
Unamortized debt issuance costs		3,886
Term Loan Facility, Net Of Unamortized Issuance Costs, Maturing 2024 [Member]
Debt Instrument [Line Items]
Total long-term debt	[1]	801,764	809,022
Unamortized debt issuance costs		3,900	4,800
Capital lease obligations [Member]
Debt Instrument [Line Items]
Total long-term debt		2,305	1,832
Other notes [Member]
Debt Instrument [Line Items]
Total long-term debt		$ 3,496	$ 4,098

[1] The carrying value of the term loan facility, maturing 2024, is net of unamortized debt issuance costs of $3.9 million at December 31, 2019 and $4.8 million at December 31, 2018.