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Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 06, 2019	Jun. 12, 2019	Mar. 13, 2019	Apr. 30, 2019	Feb. 28, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Dividends per Share [Abstract]
Payment of cash dividends								$ 41,084	$ 40,091
Repurchases of Common Stock [Abstract]
Class A common stock repurchased						$ 0	$ 18,437	825	$ 35,823
Amount available for repurchases						$ 470,200		$ 470,200
Treasury Stock [Member]
Repurchases of Common Stock [Abstract]
Class A common stock repurchased (in shares)						0	200,000	14,000	500,000
Class A common stock repurchased						$ 0	$ 18,437	$ 825	$ 35,823
Dividend Declared 2019 Q1 [Member]
Dividends per Share [Abstract]
Dividend payable, date declared						2019-02		2019-02
Dividend payable per share (in dollars per share)					$ 0.37
Payment of cash dividends			$ 20,500
Dividend payable, date paid								Mar. 13, 2019
Dividend payable, date of record								Feb. 25, 2019
Dividend Declared 2019 Q2 [Member]
Dividends per Share [Abstract]
Dividend payable, date declared						2019-04		2019-04
Dividend payable per share (in dollars per share)				$ 0.37
Payment of cash dividends		$ 20,600
Dividend payable, date paid								Jun. 12, 2019
Dividend payable, date of record								May 31, 2019
Dividend Declared 2019 Q3 [Member] \| Subsequent Event [Member]
Dividends per Share [Abstract]
Dividend payable, date declared	2019-08
Dividend payable per share (in dollars per share)	$ 0.37
Dividend payable, date paid	Sep. 11, 2019
Dividend payable, date of record	Aug. 30, 2019
Stock Options [Member]
Net Income per Share [Abstract]
Anti-dilutive shares excluded from calculation of diluted earnings per share (in shares)						1,100,000	300,000	1,100,000	900,000