CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Additional Paid-In Capital USD ($)	Accumulated Deficit USD ($)	Accumulated Other Comprehensive Loss USD ($)	Noncontrolling Interests USD ($)	Class A Common Stock	Class A Common Stock Common Stock USD ($)	Class B Common Stock	Class B Common Stock Common Stock USD ($)
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	(19,204)		(19,204)
Class A Common Stock issued pursuant to employee benefit plans	3,993	3,990					3
Class A Common Stock issued pursuant to employee benefit plans (in shares)							258,425
Tax benefit on share based award	191	191
Distributions to noncontrolling interests	(462)				(462)
Issuance of subsidiary share awards	392				392
Consolidation of variable interest entity	775				775
Amortization of net periodic pension benefit costs, net of taxes	189			189
Net income	59,206		59,419		(213)
BALANCE at Jun. 30, 2012	(66,282)	621,556	(694,296)	(4,659)	10,305		523		289
BALANCE (in shares) at Jun. 30, 2012							52,280,511		28,933,859
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	52,332,012	28,933,859	28,933,859
Increase (Decrease) in Stockholders' Equity
Dividends declared on Class A and Class B Common Stock	(26,972)		(26,972)
Issuance of common stock, net of issuance costs	472,400	472,220					180
Issuance of common stock, net of issuance costs (in shares)							18,000,000
Class B Common Stock converted into Class A Common Stock							27		(27)
Class B Common Stock converted into Class A Common Stock (in shares)							2,670,600		(2,670,600)
Class A Common Stock issued upon exercise of stock options	1,155	1,154					1
Class A Common Stock issued upon exercise of stock options (in shares)							98,000
Class A Common Stock issued pursuant to employee benefit plans	3,707	3,703					4
Class A Common Stock issued pursuant to employee benefit plans (in shares)							440,828
Tax benefit on share based award	471	471
Distributions to noncontrolling interests	(9,714)				(9,714)
Issuance of stock settled appreciation rights	3,155	3,155
Class A Common Stock sold by variable interest entity, net of taxes	7,008	7,008
Amortization of net periodic pension benefit costs, net of taxes	(78)			(78)
Net income	34,929		34,823		106
BALANCE at Jun. 30, 2013	$ 386,008	$ 1,088,639	$ (705,846)	$ (5,071)	$ 7,289		$ 735		$ 262
BALANCE (in shares) at Jun. 30, 2013						73,541,440	73,541,440	26,263,259	26,263,259