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Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Common Stock Activity [Roll Forward]
Beginning balance			$ 229,127
Ending balance	$ 234,703		234,703
Common Stock
Common Stock Activity [Roll Forward]
Beginning balance	233,786	$ 218,801	229,127	$ 211,806
Stock compensation expense	1,309	(4,044)	(3,042)	(10,130)
Ending balance	234,703	223,412	234,703	223,412
Treasury Cost
Common Stock Activity [Roll Forward]
Beginning balance	327,997	303,744	303,566	296,390
Stock compensation expense	0	0	0	0
Ending balance	327,432	303,500	327,432	303,500
Restricted and performance stock awards | Common Stock
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	50	70	2,513	2,713
Restricted and performance stock awards | Treasury Cost
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	50	70	2,513	2,713
Stock options exercised | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense	(2,276)	(637)	(4,709)	(2,967)
Stock options exercised | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense	(954)	(292)	(2,260)	(1,194)
Treasury shares purchased | Common Stock
Common Stock Activity [Roll Forward]
Treasury shares purchased	0	0	0	0
Treasury shares purchased | Treasury Cost
Common Stock Activity [Roll Forward]
Treasury shares purchased	$ (439)	$ (118)	(8,578)	(7,713)
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			(20,113)	(3,347)
Stock consideration in acquisition | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense			0	921
Stock consideration in acquisition | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense			0	0
Employee stock purchase program | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense			338	301
Employee stock purchase program | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense			$ 52	$ 43

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