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Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Common Stock Activity [Roll Forward]
Beginning balance	$ 242,693
Ending balance	245,887
Common Stock
Common Stock Activity [Roll Forward]
Beginning balance	242,693	$ 229,127
Stock compensation expense	(3,293)	(3,522)
Ending balance	245,887	232,167
Treasury Cost
Common Stock Activity [Roll Forward]
Beginning balance	326,156	303,566
Stock compensation expense	0	0
Ending balance	329,615	328,081
Restricted and performance stock awards | Common Stock
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	1,333	2,239
Restricted and performance stock awards | Treasury Cost
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	1,333	2,239
Stock options exercised | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense	(1,234)	(1,757)
Stock options exercised | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense	(556)	(976)
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	(5,348)	(7,617)
Share repurchase program | Common Stock
Common Stock Activity [Roll Forward]
Treasury shares purchased	0	0
Share repurchase program | Treasury Cost
Common Stock Activity [Roll Forward]
Treasury shares purchased	$ 0	$ (20,113)

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