Financial Commitments (Summary Of Interest Expense As Reported In The Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other interest	$ 2,134	$ 2,044	$ 1,905
Total cash interest expense	79,699	65,941	63,270
Total non-cash interest expense	5,458	3,697	5,756
Total interest expense	85,157	69,638	69,026
Credit Facility
Interest on debt	4,924	1,642	1,479
Total non-cash interest expense	745	568	568
Term Loan B
Interest on debt	38,266	27,880	24,590
Total non-cash interest expense	$ 3,592	2,084	2,175
Effective interest rates (as a percent)	11.16%
2017 Senior Notes | 2017 Senior Notes
Interest on debt	$ 34,375	34,375	34,375
Total non-cash interest expense	$ 1,121	1,045	973
Effective interest rates (as a percent)	7.13%
Convertible Debt
Interest on debt	$ 0	0	921
Total non-cash interest expense	$ 0	$ 0	$ 2,040