Consolidated Statement of Changes in Stockholders' Equity Statement - USD ($)	Total	Common Stock Common Stock, Class A	Common Stock Common Stock, Class B	Additional Paid-In Capital	Treasury Stock, at cost	Retained Earnings	Accumulated Other Comprehensive Loss
Stockholders' Equity		$ 268,000	$ 132,000	$ 506,970,000	$ (9,158,000)	$ 903,084,000	$ (102,000)
Stock-based compensation expense		1,000		7,492,000
Stock option exercises		3,000		12,892,000
Payment consideration to tax authority on employees' behalf				(1,503,000)
Net income	$ 113,890,000					113,890,000
Dividends						(43,207,000)
Translation adjustments, net of tax	(77,000)						(77,000)
Actuarial gain (loss) on defined benefit pension plans, net of tax	(19,000)						(19,000)
Cumulative-effect adjustment for adoption of Accounting Standard Update 2018-02	(24,000)						(24,000)
Stockholders' Equity	1,490,642,000	272,000	132,000	525,851,000	(9,158,000)	973,767,000	(222,000)
Stock-based compensation expense		1,000		11,365,000
Stock option exercises		2,000		10,247,000
Payment consideration to tax authority on employees' behalf				(1,746,000)
Net income	120,530,000					120,530,000
Dividends						(51,621,000)
Translation adjustments, net of tax	(41,000)						(41,000)
Actuarial gain (loss) on defined benefit pension plans, net of tax	33,000						33,000
Cumulative-effect adjustment for adoption of Accounting Standard Update 2018-02	0						0
Stockholders' Equity	1,579,412,000	275,000	132,000	545,717,000	(9,158,000)	1,042,676,000	(230,000)
Stock-based compensation expense		2,000		15,367,000
Stock option exercises		2,000		9,756,000
Payment consideration to tax authority on employees' behalf				(4,267,000)
Net income	137,017,000					137,017,000
Dividends						(61,826,000)
Translation adjustments, net of tax	(72,000)						(72,000)
Actuarial gain (loss) on defined benefit pension plans, net of tax	29,000						29,000
Cumulative-effect adjustment for adoption of Accounting Standard Update 2018-02	0						0
Stockholders' Equity	$ 1,675,420,000	$ 279,000	$ 132,000	$ 566,573,000	$ (9,158,000)	$ 1,117,867,000	$ (273,000)