Financial Commitments (Summary Of Interest Expense As Reported In The Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other interest	$ 2,044	$ 1,905	$ 2,079
Cash portion of loss on extinguishment	0	0	786
Total cash interest expense	65,941	63,270	56,059
Total non-cash interest expense	3,697	5,756	20,153
Non-cash portion of loss on extinguishment	0	0	8,312
Total interest expense	69,638	69,026	76,212
Term Loan B
Interest on debt	27,880	24,590	9,028
Total non-cash interest expense	$ 2,084	2,175	784
Effective interest rates (as a percent)	6.43%
Convertible Debt
Interest on debt	$ 0	921	4,373
Total non-cash interest expense	0	2,040	8,944
Credit Facility
Interest on debt	1,642	1,479	77
Total non-cash interest expense	568	568	206
2017 Senior Notes | 2017 Senior Notes
Interest on debt	34,375	34,375	34,375
Total non-cash interest expense	$ 1,045	973	906
Effective interest rates (as a percent)	7.13%
2017 Credit Facility | Credit Facility
Interest on debt	$ 0	0	5,341
Total non-cash interest expense	$ 0	$ 0	$ 1,001