CONSOLIDATED STATEMENTS OF EQUITY (DEFICIT) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Class A Common Stock	Class B Common Stock
BALANCE at Dec. 31, 2010	$ (157,082)	$ 609,640	$ (771,953)	$ (3,914)	$ 8,341	$ 503	$ 301
BALANCE (in shares) at Dec. 31, 2010						50,284,052	30,083,819
Increase (Decrease) in Stockholders' Equity
Dividends declared on Class A and Class B Common Stock	(38,356)		(38,356)
Class B Common Stock converted into Class A Common Stock						12	(12)
Class B Common Stock converted into Class A Common Stock (in shares)						1,149,960	(1,149,960)
Convertible Debentures converted into Class A Common Stock, net of taxes	30	30
Convertible Debentures converted into Class A Common Stock, net of taxes (in shares)						1,315
Class A Common Stock issued pursuant to employee benefit plans	5,831	5,826				5
Class A Common Stock issued pursuant to employee benefit plans (in shares)						586,759
Tax benefit on share based awards	734	734
Distributions to noncontrolling interests	(270)				(270)
Class A Common Stock sold by variable interest entity, net of taxes	1,808	1,808
Issuance of subsidiary share awards	3,201				3,201
Purchase of subsidiary shares from noncontrolling interests	(2,501)	(663)			(1,838)
Other comprehensive income	(934)			(934)
Net income	76,177		75,798		379
BALANCE at Dec. 31, 2011	(111,362)	617,375	(734,511)	(4,848)	9,813	520	289
BALANCE (in shares) at Dec. 31, 2011						52,022,086	28,933,859
Increase (Decrease) in Stockholders' Equity
Dividends declared on Class A and Class B Common Stock	(123,852)		(123,852)
Class A Common Stock issued pursuant to employee benefit plans	5,105	5,102				3
Class A Common Stock issued pursuant to employee benefit plans (in shares)						309,926
Tax benefit on share based awards	271	271
Distributions to noncontrolling interests	(1,142)				(1,142)
Purchase of assets from entity under common control	(23,638)	(23,638)
Issuance of subsidiary share awards	707				707
Purchase of subsidiary shares from noncontrolling interests		1,818			(1,818)
Consolidation of variable interest entity	9,050				9,050
Other comprehensive income	(145)			(145)
Net income	144,953		144,666		287
BALANCE at Dec. 31, 2012	(100,053)	600,928	(713,697)	(4,993)	16,897	523	289
BALANCE (in shares) at Dec. 31, 2012						52,332,012	28,933,859
Increase (Decrease) in Stockholders' Equity
Dividends declared on Class A and Class B Common Stock	(56,767)		(56,767)
Issuance of common stock, net of issuance costs	472,913	472,733				180
Issuance of common stock, net of issuance costs (in shares)						18,000,000
Class B Common Stock converted into Class A Common Stock						29	(29)
Class B Common Stock converted into Class A Common Stock (in shares)						2,905,502	(2,905,502)
Redemption of 3% Convertible Debentures, net of taxes	(5,100)	(5,100)
Convertible Debentures converted into Class A Common Stock, net of taxes	8,602	8,599				3
Convertible Debentures converted into Class A Common Stock, net of taxes (in shares)						338,632
Class A Common Stock issued pursuant to employee benefit plans	10,235	10,229				6
Class A Common Stock issued pursuant to employee benefit plans (in shares)						569,423
Tax benefit on share based awards	521	521
Distributions to noncontrolling interests	(10,256)				(10,256)
Class A Common Stock sold by variable interest entity, net of taxes	7,008	7,008
Issuance of subsidiary share awards	344				344
Other comprehensive income	2,440			2,440
Net income	75,817		73,468		2,349
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