Capital Stock - Common Stock Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	54,382,659
Common stock, shares outstanding, end of period (shares)	54,518,047	54,382,659
Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Common stock, shares outstanding, beginning of period (shares)	54,383,000	54,514,000	54,715,000
Exercise of stock appreciation rights (shares)	147,000	87,000	84,000
Director compensation arrangements, net (shares)	7,000	9,000	10,000
Restricted/performance shares activity, net of forfeitures (shares)	101,000	132,000	39,000
Acquisition/surrender of shares (shares)	(120,000)	(359,000)	(334,000)
Common stock, shares outstanding, end of period (shares)	54,518,000	54,383,000	54,514,000