Financial Commitments (Summary Of Interest Expense As Reported In The Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other interest	$ 1,905	$ 2,079	$ 2,172
Cash portion of loss on extinguishment	0	786	0
Total cash interest expense	63,270	56,059	54,287
Total non-cash interest expense	5,756	20,153	13,207
Non-cash portion of loss on extinguishment	0	8,312	0
Total interest expense	69,026	76,212	67,494
Term Loan B
Interest on debt	24,590	9,028	0
Total non-cash interest expense	$ 2,175	784	0
Effective interest rates	6.48%
Convertible Debt
Interest on debt	$ 921	4,373	5,750
Total non-cash interest expense	$ 2,040	8,944	10,811
Effective interest rates	9.39%
2017 Senior Notes | 2017 Senior Notes
Interest on debt	$ 34,375	34,375	34,375
Total non-cash interest expense	$ 973	906	844
Effective interest rates	7.13%
Credit Facility 2020
Interest on debt	$ 1,479	77	0
Total non-cash interest expense	568	206	0
2017 Credit Facility | Credit Facility
Interest on debt	0	5,341	11,990
Total non-cash interest expense	$ 0	$ 1,001	$ 1,552