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Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended
	Mar. 11, 2020	Apr. 30, 2020	Feb. 29, 2020	Mar. 31, 2020	Mar. 31, 2019
Dividends per Share [Abstract]
Payment of cash dividends				$ 20,686	$ 20,531
Repurchases of Common Stock [Abstract]
Class A common stock repurchased				60,886	$ 825
Amount available for repurchases				$ 409,300
Treasury Stock [Member]
Repurchases of Common Stock [Abstract]
Class A common stock repurchased (in shares)				2,600,000	14,000
Class A common stock repurchased				$ 60,886	$ 825
Dividend Declared 2020-Q1 [Member]
Dividends per Share [Abstract]
Dividend payable, date declared				2020-02
Dividend payable per share (in dollars per share)			$ 0.375
Payment of cash dividends	$ 20,700
Dividend payable, date paid				Mar. 11, 2020
Dividend payable, date of record				Feb. 28, 2020
Dividend Declared 2020-Q2 [Member] \| Subsequent Event [Member]
Dividends per Share [Abstract]
Dividend payable, date declared		2020-04
Dividend payable per share (in dollars per share)		$ 0.375
Dividend payable, date paid		Jun. 10, 2020
Dividend payable, date of record		May 29, 2020
Stock Options [Member]
Net Income per Share [Abstract]
Anti-dilutive shares excluded from calculation of diluted earnings per share (in shares)				1,000,000.0	1,000,000.0