Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Common Stock
Common Stock Activity [Roll Forward]
Beginning balance	$ 262,627	$ 245,887	$ 260,121	$ 242,693
Stock compensation expense	4,629	7,403	8,358	10,695
Ending balance	267,645	253,773	267,645	253,773
Treasury Cost
Common Stock Activity [Roll Forward]
Beginning balance	(331,160)	(329,615)	(328,776)	(326,156)
Stock compensation expense	0	0	0	0
Ending balance	(359,314)	(329,439)	(359,314)	(329,439)
Restricted and performance stock awards | Common Stock
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	(201)	(170)	(1,461)	(1,502)
Restricted and performance stock awards | Treasury Cost
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	201	170	1,461	1,502
Stock options exercised | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense	166	244	203	1,478
Stock options exercised | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense	80	126	95	683
Treasury shares purchased for stock compensation programs | Common Stock
Common Stock Activity [Roll Forward]
Treasury shares purchased for stock compensation programs	0	0	0	0
Treasury shares purchased for stock compensation programs | Treasury Cost
Common Stock Activity [Roll Forward]
Treasury shares purchased for stock compensation programs	(272)	(163)	(3,931)	(5,511)
Employee stock purchase program | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense	424	409	424	409
Employee stock purchase program | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense	62	43	62	43
Share repurchase program | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense	0	0	0	0
Share repurchase program | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense	$ (28,225)	$ 0	$ (28,225)	$ 0