CONSOLIDATED STATEMENTS OF EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interests
BALANCE at Dec. 31, 2013	$ 405,704			$ 741	$ 260	$ 1,094,918	$ (696,996)	$ (2,553)	$ 9,334
BALANCE (in shares) at Dec. 31, 2013				74,145,569	26,028,357
Increase (Decrease) in Stockholders' Equity
Dividends declared on Class A and Class B Common Stock	(61,103)						(61,103)
Class B Common Stock converted into Class A Common Stock				$ 1	$ (1)
Class B Common Stock converted into Class A Common Stock (in shares)				100,000	(100,000)
Repurchases of Class A Common Stock	(133,157)			$ (48)		(133,109)
Repurchase of Class A Common Stock (in shares)				(4,876,121)
Class A Common Stock issued pursuant to employee benefit plans	11,512			$ 2		11,510
Class A Common Stock issued pursuant to employee benefit plans (in shares)				209,451
Tax benefit on share based awards	1,365					1,365
Distributions to noncontrolling interests	(6,936)								(6,936)
Deconsolidation of variable interest entity	(23,801)					4,518		(546)	(27,773)
Other comprehensive income	(3,356)							(3,356)
Net income	215,115						212,279		2,836
BALANCE at Dec. 31, 2014	405,343			$ 696	$ 259	979,202	(545,820)	(6,455)	(22,539)
BALANCE (in shares) at Dec. 31, 2014				69,578,899	25,928,357
Increase (Decrease) in Stockholders' Equity
Dividends declared on Class A and Class B Common Stock	(62,733)						(62,733)
Repurchases of Class A Common Stock	(28,823)			$ (11)		(28,812)
Repurchase of Class A Common Stock (in shares)				(1,107,887)
Class A Common Stock issued pursuant to employee benefit plans	11,627			$ 3		11,624
Class A Common Stock issued pursuant to employee benefit plans (in shares)				321,471
Tax benefit on share based awards	712					712
Distributions to noncontrolling interests	(9,918)								(9,918)
Issuance of subsidiary share awards	1,750								1,750
Other comprehensive income	5,621							5,621
Net income	176,099						171,524		4,575
BALANCE at Dec. 31, 2015	499,678			$ 688	$ 259	962,726	(437,029)	(834)	(26,132)
BALANCE (in shares) at Dec. 31, 2015		68,792,483	25,928,357	68,792,483	25,928,357
Increase (Decrease) in Stockholders' Equity
Cumulative effect of adoption of new accounting standard	2,264					431	1,833
Dividends declared on Class A and Class B Common Stock	(65,909)						(65,909)
Class B Common Stock converted into Class A Common Stock	0			$ 2	$ (2)
Class B Common Stock converted into Class A Common Stock (in shares)				257,673	(257,673)
Repurchases of Class A Common Stock	$ (136,283)			$ (48)		(136,235)
Repurchase of Class A Common Stock (in shares)	(4,900,000)			(4,892,461)
Class A Common Stock issued pursuant to employee benefit plans	$ 16,773			$ 4		16,769
Class A Common Stock issued pursuant to employee benefit plans (in shares)				400,512
Distributions to noncontrolling interests	(10,722)								(10,722)
Issuance of subsidiary share awards	1,346								1,346
Other comprehensive income	27							27
Net income	250,762						245,301		5,461
BALANCE at Dec. 31, 2016	$ 557,936			$ 646	$ 257	$ 843,691	$ (255,804)	$ (807)	$ (30,047)
BALANCE (in shares) at Dec. 31, 2016		64,558,207	25,760,684	64,558,207	25,670,684