Financial Commitments (Summary of Interest Expense as Reported in the Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
Other interest	$ 461	$ 481
Total cash interest expense	15,591	15,793
Non-cash interest expense	901	2,017
Total non-cash interest expense	901	2,017
Total interest expense	16,492	17,810
Term Loan B
Debt Instrument [Line Items]
Cash interest expense	6,033	6,094
Non-cash interest expense	$ 505	539
Effective interest rates	6.43%
Convertible Notes
Debt Instrument [Line Items]
Cash interest expense		503
Non-cash interest expense		1,099
2017 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Cash interest expense	$ 8,594	8,594
Non-cash interest expense	$ 254	237
Effective interest rates	7.13%
2020 Revolver
Debt Instrument [Line Items]
Cash interest expense	$ 503	121
Non-cash interest expense	$ 142	$ 142