CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Class A Common Stock	Class A Common Stock Common Stock	Class B Common Stock	Class B Common Stock Common Stock
BALANCE at Dec. 31, 2013	$ 405,704	$ 1,094,918	$ (696,996)	$ (2,553)	$ 9,334		$ 741		$ 260
BALANCE (in shares) at Dec. 31, 2013							74,145,569		26,028,357
Increase (Decrease) in Stockholders' Equity
Dividends declared and paid on Class A and Class B Common Stock	(45,322)		(45,322)
Class B Common Stock converted into Class A Common Stock (in shares)							50,000		(50,000)
Repurchases of Class A Common Stock	(108,476)	(108,438)					$ (38)
Repurchases of Class A Common Stock (in shares)							(3,914,506)
Class A Common Stock issued pursuant to employee benefit plans	9,552	9,550					$ 2
Class A Common Stock issued pursuant to employee benefit plans (in shares)							185,590
Tax benefit on share based awards	1,399	1,399
Distributions to noncontrolling interests	(3,046)				(3,046)
Deconsolidation of variable interest equity	(23,800)	4,518		(546)	(27,772)
Other comprehensive income	406			406
Net income	118,026		116,834		1,192
BALANCE at Sep. 30, 2014	354,443	1,001,947	(625,484)	(2,693)	(20,292)		$ 705		$ 260
BALANCE (in shares) at Sep. 30, 2014							70,466,653		25,978,357
BALANCE at Dec. 31, 2014	405,343	979,202	(545,820)	(6,455)	(22,539)		$ 696		$ 259
BALANCE (in shares) at Dec. 31, 2014						69,578,899	69,578,899	25,928,357	25,928,357
Increase (Decrease) in Stockholders' Equity
Dividends declared and paid on Class A and Class B Common Stock	(47,104)		(47,104)
Repurchases of Class A Common Stock	$ (28,823)	(28,812)					$ (11)
Repurchases of Class A Common Stock (in shares)	(1,100,000)						(1,107,887)
Class A Common Stock issued pursuant to employee benefit plans	$ 10,619	10,616					$ 3
Class A Common Stock issued pursuant to employee benefit plans (in shares)							291,911
Tax benefit on share based awards	703	703
Distributions to noncontrolling interests	(6,655)				(6,655)
Other comprehensive income	178			178
Issuance of subsidiary stock awards	1,731				1,731
Net income	115,269		113,324		1,945
BALANCE at Sep. 30, 2015	$ 451,261	$ 961,709	$ (479,600)	$ (6,277)	$ (25,518)		$ 688		$ 259
BALANCE (in shares) at Sep. 30, 2015						68,762,925	68,762,923	25,928,357	25,928,357