Supplemental Financial Information (Components of Interest Expense, Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Income Statement Elements [Abstract]
Interest on revolving credit facility	$ 892	$ 3,294	$ 7,378
Interest rate swap settlements	0	3,191	(200)
Line of credit fees	1,066	715	576
Debt issuance amortization costs	715	593	552
Interest on finance leases	287	134	127
Interest income	(541)	(939)	(1,610)
Other	117	147	46
Total interest expense, net	$ 2,536	$ 7,135	$ 6,869