Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Common Stock
Common Stock Activity [Roll Forward]
Beginning balance	$ 260,121	$ 242,693
Stock compensation expense	3,730	3,293
Ending balance	262,627	245,887
Treasury Cost
Common Stock Activity [Roll Forward]
Beginning balance	(328,776)	(326,156)
Stock compensation expense	0	0
Ending balance	(331,160)	(329,615)
Restricted and performance stock awards | Common Stock
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	(1,260)	(1,333)
Restricted and performance stock awards | Treasury Cost
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	1,260	1,333
Stock options exercised | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense	36	1,234
Stock options exercised | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense	15	556
Treasury shares purchased | Common Stock
Common Stock Activity [Roll Forward]
Treasury shares purchased	0	0
Treasury shares purchased | Treasury Cost
Common Stock Activity [Roll Forward]
Treasury shares purchased	$ (3,659)	$ (5,348)