Condensed Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Additional paid-in capital Class A common stock	Additional paid-in capital	Common Stock Class A common stock	Common Stock Class B common stock	(Accumulated deficit) retained earnings Class A common stock	(Accumulated deficit) retained earnings	Accumulated other comprehensive income	Non-controlling interest	Class A common stock	Class B common stock	Total
Beginning balance, Value at Dec. 31, 2014		$ 241,882	$ 1			$ 12,041	$ 886	$ (215,527)			$ 39,283
Beginning balance, Shares at Dec. 31, 2014			11,768,041	1					11,768,041	1
Net income						7,688		17,500			25,188
Distributions paid to non-controlling unitholders								(34,357)			(34,357)
Equity-based compensation		668									668
Dividends to Class A common stockholders					$ 20,912				$ 20,912
Change in accumulated other comprehensive income							(759)	301			(458)
Issuance of Class A common stock, equity-based compensation plans	$ 2,012								$ 2,012
Issuance of Class A common stock, equity-based compensation plans, shares			561,069
Excess tax benefit realized on exercise of stock options		2,361									2,361
Ending balance, Value at Jun. 30, 2015		$ 246,923	$ 1			$ (1,183)	$ 127	$ (232,083)			$ 13,785
Ending balance, Shares at Jun. 30, 2015			12,329,110	1					12,329,110	1