CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND NONCONTROLLING INTEREST (USD $) In Thousands	Total	Convertible Preferred Stock [Member]	Common Stock Class A [Member]	Common Stock Class B [Member]	Common Stock Class C [Member]	Common Stock Class D [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Noncontrolling Interest [Member]
BALANCE at Dec. 31, 2011	$ 410,598	$ 0	$ 3	$ 3	$ 3	$ 41	$ (199)	$ 1,001,840	$ (796,156)	$ 205,063
Consolidated net loss	(53,489)	0	0	0	0	0	0	0	(66,865)	13,376
Net change in unrealized gain on investment activities, net of taxes	97	0	0	0	0	0	97	0	0	0
Stock-based compensation expense	171	0	0	0	0	0	0	171	0	0
Conversion of shares of Class A common stock to Class D common stock	0	0	0	0	0	0	0	0	0	0
Adjustment of redeemable noncontrolling interests to estimated redemption value	4,862	0	0	0	0	0	0	4,862	0	0
Dividends paid to noncontrolling interest	(7,741)	0	0	0	0	0	0	0	0	(7,741)
BALANCE at Dec. 31, 2012	354,498	0	3	3	3	41	(102)	1,006,873	(863,021)	210,698
Consolidated net loss	(44,174)	0	0	0	0	0	0	0	(61,981)	17,807
Net change in unrealized gain on investment activities, net of taxes	(111)	0	0	0	0	0	(111)	0	0	0
Stock-based compensation expense	191	0	0	0	0	0	0	191	0	0
Repurchase of 32,669 shares of Class A common stock	(71)	0	0	0	0	0	0	(71)	0	0
Repurchase of 2,630,574 shares of Class D common stock	(5,398)	0	0	0	0	(2)	0	(5,396)	0	0
Adjustment of redeemable noncontrolling interests to estimated redemption value	1,519	0	0	0	0	0	0	1,519	0	0
Dividends paid to noncontrolling interest	(21,479)	0	0	0	0	0	0	0	0	(21,479)
BALANCE at Dec. 31, 2013	284,975	0	3	3	3	39	(213)	1,003,116	(925,002)	207,026
Consolidated net loss	(43,379)	0	0	0	0	0	0	0	(62,670)	19,291
Net change in unrealized gain on investment activities, net of taxes	98	0	0	0	0	0	98	0	0	0
Stock-based compensation expense	1,594	0	0	0	0	2	0	1,592	0	0
Conversion of shares of Class A common stock to Class D common stock	0	0	(1)	0	0	1	0	0	0	0
Conversion of 192,142 shares of Class C common stock to Class D common stock	0	0	0	0	0	0	0	0	0	0
Adjustment of redeemable noncontrolling interests to estimated redemption value	1,802	0	0	0	0	0	0	1,802	0	0
Exercise of options for 92,040 shares of common stock	125	0	0	0	0	0	0	125	0	0
Dividends paid to noncontrolling interest	(24,643)	0	0	0	0	0	0	0	0	(24,643)
BALANCE at Dec. 31, 2014	$ 220,572	$ 0	$ 2	$ 3	$ 3	$ 42	$ (115)	$ 1,006,635	$ (987,672)	$ 201,674