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Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Common Stock Activity [Roll Forward]
Beginning balance			$ 801,898
Ending balance	$ 824,177		824,177
Common Stock
Common Stock Activity [Roll Forward]
Beginning balance	253,773	$ 233,786	242,693	$ 229,127
Stock compensation expense	2,867	(1,309)	13,562	3,042
Acquisition of noncontrolling interest in consolidated subsidiaries (Note 19)	(4,751)	0	(4,751)	0
Ending balance	252,084	234,703	252,084	234,703
Treasury Cost
Common Stock Activity [Roll Forward]
Beginning balance	(329,439)	(327,997)	(326,156)	(303,566)
Stock compensation expense	0	0	0	0
Acquisition of noncontrolling interest in consolidated subsidiaries (Note 19)	0	0	0	0
Ending balance	(329,750)	(327,432)	(329,750)	(327,432)
Restricted and performance stock awards | Common Stock
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	(159)	(50)	(1,662)	(2,513)
Restricted and performance stock awards | Treasury Cost
Common Stock Activity [Roll Forward]
Restricted and performance stock awards	159	50	1,662	2,513
Stock options exercised | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense	354	2,276	1,833	4,709
Stock options exercised | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense	155	954	838	2,260
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	$ (625)	$ (439)	(6,137)	(8,578)
Employee stock purchase program | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense			409	338
Employee stock purchase program | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense			43	52
Share repurchase program | Common Stock
Common Stock Activity [Roll Forward]
Stock compensation expense			0	0
Share repurchase program | Treasury Cost
Common Stock Activity [Roll Forward]
Stock compensation expense			$ 0	$ (20,113)

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