CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' (DEFICIT) - 3 months ended Mar. 31, 2016 - 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]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
BALANCE at Dec. 31, 2015	$ (71,824)	$ 0	$ 2	$ 3	$ 3	$ 42	$ 983,847	$ (1,055,721)
Consolidated net loss	(3,947)	0	0	0	0	0	0	(3,947)
Repurchase of 390,677 shares of Class D common stock	(649)	0	0	0	0	0	(649)	0
Conversion of 134,195 shares of Class A common stock to Class D common stock	0	0	0	0	0	0	0	0
Adjustment of redeemable noncontrolling interests to estimated redemption value	(377)	0	0	0	0	0	(377)	0
Stock-based compensation expense	772	0	0	0	0	0	772	0
BALANCE at Mar. 31, 2016	$ (76,025)	$ 0	$ 2	$ 3	$ 3	$ 42	$ 983,593	$ (1,059,668)