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 (shares) at Dec. 31, 2014							69,578,899		25,928,357
BALANCE at Dec. 31, 2014	$ 405,343	$ 979,202	$ (545,820)	$ (6,455)	$ (22,539)		$ 696		$ 259
Increase (Decrease) in Stockholders' Equity
Dividends declared and paid on Class A and Class B Common Stock	(15,715)		(15,715)
Repurchases of Class A Common Stock (shares)							(304,787)
Repurchases of Class A Common Stock	(7,803)	(7,800)					$ (3)
Class A Common Stock issued pursuant to employee benefit plans (in shares)							217,803
Class A Common Stock issued pursuant to employee benefit plans	7,826	7,824					$ 2
Tax benefit on share based awards	688	688
Distributions to noncontrolling interests, net	(2,819)				(2,819)
Other comprehensive income	84			84
Net income	24,836		24,282		554
BALANCE (shares) at Mar. 31, 2015							69,491,915		25,928,357
BALANCE at Mar. 31, 2015	412,440	979,914	(537,253)	(6,371)	(24,804)		$ 695		$ 259
BALANCE (shares) at Dec. 31, 2015						68,792,483	68,792,483	25,928,357	25,928,357
BALANCE at Dec. 31, 2015	499,678	962,726	(437,029)	(834)	(26,132)		$ 688		$ 259
Increase (Decrease) in Stockholders' Equity
Dividends declared and paid on Class A and Class B Common Stock	(15,675)		(15,675)
Class A Common Stock issued pursuant to employee benefit plans (in shares)							279,618
Class A Common Stock issued pursuant to employee benefit plans	10,509	10,506	0				$ 3
Distributions to noncontrolling interests, net	(2,713)				(2,713)
Issuance of subsidiary stock awards	206				206
Net income	25,629		24,140		1,489
BALANCE (shares) at Mar. 31, 2016						69,072,101	69,072,101	25,928,357	25,928,357
BALANCE at Mar. 31, 2016	519,898	973,663	(426,731)	$ (834)	$ (27,150)		$ 691		$ 259
Increase (Decrease) in Stockholders' Equity
Cumulative effect of adoption of new accounting standard	$ 2,264	$ 431	$ 1,833