Consolidated Statement of Changes In Stockholders' Equity - 9 months ended Sep. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Common Stock Class A common stock	Common Stock Class B common stock	Treasury Stock Class A common stock	Additional Paid-in-Capital	Retained (Deficit) Earnings	Non-controlling Interest	Total
Balance at Dec. 31, 2014	$ 13	$ 37	$ (358)	$ 178,763	$ 38,950	$ 635,945	$ 853,350
Balance (in shares) at Dec. 31, 2014	12,622	36,719	23
Increase (Decrease) Stockholders' equity
Sale of common stock	$ 12			123,189			123,201
Sale of common stock (in shares)	12,263
Exchange of Class B Shares for Class A Shares	$ 6	$ (6)		54,116		(92,213)	(38,097)
Exchange of Class B shares for Class A shares (in shares)	5,436	(5,436)
Stock-compensation expense				5,287			5,287
Vested restricted shares	121
Net income (loss)					(3,017)	(7,625)	(10,642)
Balance at Sep. 30, 2015	$ 31	$ 31	$ (358)	$ 361,355	$ 35,933	$ 536,107	$ 933,099
Balance (in shares) at Sep. 30, 2015	30,442	31,283	23