Capital Stock - (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capital Stock [Roll Forward]
Treasury Shares, Beginning Balance	(4,184,000)	(3,953,000)	(3,841,000)
Treasury Shares, Ending Balance	(4,397,000)	(4,184,000)	(3,953,000)
Number of stock awards canceled	78,530	108,926	191,912
Common Stock
Capital Stock [Roll Forward]
Common Stock, Beginning Balance	38,613,000	37,609,000	37,010,000
Restricted stock awards	803,000	1,002,000	599,000
Common Stock, Ending Balance	39,416,000	38,613,000	37,609,000
Conversion of Class B Shares to Common Shares		2,000
Dividends		$ 0.0125	$ 0.05
Class B Common Shares
Capital Stock [Roll Forward]
Common Stock, Beginning Balance	4,000	6,000	6,000
Restricted stock awards	0	0	0
Common Stock, Ending Balance	4,000	4,000	6,000
Conversion of Class B Shares to Common Shares		(2,000)
Treasury Shares
Capital Stock [Roll Forward]
Restricted stock awards	(213,000)	(231,000)	(112,000)