Financial Commitments (Summary of Interest Expense as Reported in the Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Other interest	$ 559	$ 532	$ 1,499	$ 1,422
Total cash interest expense	16,080	15,760	46,959	47,640
Non-cash interest expense			2,751	4,802
Total non-cash interest expense	935	934	2,752	4,802
Total interest expense	17,015	16,694	49,711	52,442
Term Loan B
Debt Instrument [Line Items]
Cash interest expense	6,822	6,198	18,940	18,407
Non-cash interest expense	$ 528	547	$ 1,549	1,613
Effective interest rates	6.43%		6.43%
Convertible Notes
Debt Instrument [Line Items]
Cash interest expense				921
Non-cash interest expense				2,040
2017 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Cash interest expense	$ 8,593	8,594	$ 25,781	25,781
Non-cash interest expense	$ 263	245	$ 776	723
Effective interest rates	7.13%		7.13%
2020 Revolver
Debt Instrument [Line Items]
Cash interest expense	$ 106	436	$ 739	1,109
Non-cash interest expense	$ 144	$ 142	$ 427	$ 426