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	(31,464)		(31,464)
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 (shares)							261,050
Class A Common Stock issued pursuant to employee benefit plans	9,512	9,510					$ 2
Tax benefit on share based awards	695	695
Distributions to noncontrolling interests, net	(2,464)				(2,464)
Issuance of subsidiary stock awards	1,037				1,037
Other comprehensive income	168			168
Net income	71,235		70,069		1,166
BALANCE (shares) at Jun. 30, 2015							69,535,162		25,928,357
BALANCE at Jun. 30, 2015	446,259	981,607	(507,215)	(6,287)	(22,800)		$ 695		$ 259
Increase (Decrease) in Stockholders' Equity
Cumulative effect of adoption of new accounting standard	2,264	431	1,833
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	$ (32,781)		(32,781)
Repurchases of Class A Common Stock (shares)	(400,000.0)						(384,700)
Repurchases of Class A Common Stock	$ (11,247)	(11,243)					$ (4)
Class A Common Stock issued pursuant to employee benefit plans (shares)							327,167
Class A Common Stock issued pursuant to employee benefit plans	12,907	12,904	0				$ 3
Distributions to noncontrolling interests, net	(4,370)				(4,370)
Issuance of subsidiary stock awards	214				214
Net income	76,229		73,559		2,670
BALANCE (shares) at Jun. 30, 2016						68,734,950	68,734,950	25,928,357	25,928,357
BALANCE at Jun. 30, 2016	$ 542,894	$ 964,818	$ (394,418)	$ (834)	$ (27,618)		$ 687		$ 259