Financial Commitments (Summary of Interest Expense as Reported in the Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Other interest	$ 479	$ 409	$ 940	$ 890
Total cash interest expense	15,288	16,087	30,879	31,880
Non-cash interest expense			1,817	3,868
Total non-cash interest expense	916	1,851	1,817	3,868
Total interest expense	16,204	17,938	32,696	35,748
Term Loan B
Debt Instrument [Line Items]
Cash interest expense	6,085	6,115	12,118	12,209
Non-cash interest expense	$ 516	527	$ 1,021	1,066
Effective interest rates	6.43%		6.43%
Convertible Notes
Debt Instrument [Line Items]
Cash interest expense		418		921
Non-cash interest expense		941		2,040
2017 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Cash interest expense	$ 8,594	8,593	$ 17,188	17,187
Non-cash interest expense	$ 259	241	$ 513	478
Effective interest rates	7.13%		7.13%
2020 Revolver
Debt Instrument [Line Items]
Cash interest expense	$ 130	552	$ 633	673
Non-cash interest expense	$ 141	$ 142	$ 283	$ 284