Income Taxes (Income (Loss) Before Income Taxes from Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of income before income taxes
U.S.									$ 143,712	$ (38,319)	$ 8,159
Foreign									17,058	11,238	4,862
Income (loss) before income taxes from continuing operations	$ 76,636	$ 16,317	$ 53,701	$ 14,116	$ 23,635	$ (2,360)	$ 5,226	$ (53,582)	$ 160,770	$ (27,081)	$ 13,021