CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015	$ 2,456,744	$ 324,419	$ 539,505	$ 7,111,129	$ (130,951)	$ (5,652,131)	$ 264,773
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	487,999			436,697			51,302
Redeemable noncontrolling interests	(4,511)						(4,511)
Other comprehensive loss, net of tax	(35,487)				(27,980)		(7,507)
Comprehensive income	448,001
Dividends declared	(120,784)			(120,784)
Spin-off of businesses	(45,128)			(42,486)	(2,642)
Distributions to noncontrolling membership shareholders	(18,840)						(18,840)
Treasury stock acquired	(161,891)					(161,891)
Stock-based awards activity	(20,352)		(84,648)			64,296
Stock-based compensation	17,590		17,590
Other activity	(2,335)		1,295				(3,630)
Ending Balance at Dec. 31, 2016	2,553,005	324,419	473,742	7,384,556	(161,573)	(5,749,726)	281,587
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	215,046			273,744			(58,698)
Redeemable noncontrolling interests	(2,797)						(2,797)
Other comprehensive loss, net of tax	54,209			(6,260)	54,650		5,819
Comprehensive income	266,458
Dividends declared	(75,164)			(75,164)
Spin-off of businesses	(1,513,881)			(1,513,881)
Distributions to noncontrolling membership shareholders	(22,980)						(22,980)
Treasury stock acquired	(23,480)					(23,480)
Stock-based awards activity	(3,931)		(109,560)			105,629
Stock-based compensation	17,098		17,098
Deconsolidation of CareerBuilder	(202,931)						(202,931)
Other activity	847		847
Ending Balance at Dec. 31, 2017	995,041	324,419	382,127	6,062,995	(106,923)	(5,667,577)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change	(3,724)			21,121	(24,845)
Net income	405,665			405,665
Other comprehensive loss, net of tax	(4,743)				(4,743)
Comprehensive income	400,922
Dividends declared	(60,269)			(60,269)
Treasury stock acquired	(5,831)					(5,831)
Stock-based awards activity	(500)		(96,060)			95,560
Stock-based compensation	12,531		12,531
Other activity	2,754		2,754
Ending Balance at Dec. 31, 2018	$ 1,340,924	$ 324,419	$ 301,352	$ 6,429,512	$ (136,511)	$ (5,577,848)	$ 0