Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Class A common stock	Class B common stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Total
Balance at beginning of period at Dec. 31, 2014	$ 198	$ 316		$ 136,896	$ (24,118)	$ 85	$ 61,008	$ 174,385
Balance at beginning of the period (in shares) at Dec. 31, 2014	19,770,893	31,621,542
Changes in Equity
Net income (loss)					12,467		34,349	46,816
Equity-based compensation	$ 1			18,605			1,912	20,518
Equity-based compensation (in shares)	81,608	(5,300)
Other comprehensive income (loss)						570	996	1,566
Dividends and distributions				1,339	(9,298)		(39,795)	(47,754)
Treasury Stock purchases			$ (5,953)					$ (5,953)
Treasury Stock purchases (in shares)			(192,660)					(192,660)
Class A Partnership Units and other equity purchased or converted into Class A Common Stock	$ 5	$ (2)		4,203			(652)	$ 3,554
Class A Partnership Units and other equity purchased or converted into Class A Common Stock (in shares)	501,259	(213,569)
Net excess tax benefit from Equity-based compensation				47				47
Balance at end of period at Jun. 30, 2015	$ 204	$ 314	$ (5,953)	161,090	(20,949)	655	57,818	193,179
Balance at end of the period (in shares) at Jun. 30, 2015	20,353,760	31,402,673	(192,660)
Balance at beginning of period at Dec. 31, 2015	$ 205	$ 312	$ (7,616)	190,703	(15,338)	108	89,044	257,418
Balance at beginning of the period (in shares) at Dec. 31, 2015	20,536,740	31,229,236	(263,622)
Changes in Equity
Net income (loss)					13,863		37,961	51,824
Equity-based compensation	$ 3			37,070			1,633	38,706
Equity-based compensation (in shares)	250,042	(1,774)
Other comprehensive income (loss)						(248)	(409)	(657)
Dividends and distributions				7,774	(36,483)		(89,201)	(117,910)
Treasury Stock purchases			$ (2,609)					$ (2,609)
Treasury Stock purchases (in shares)			(97,601)					(97,601)
Class A Partnership Units and other equity purchased or converted into Class A Common Stock	$ 1	$ (1)		900			(117)	$ 783
Class A Partnership Units and other equity purchased or converted into Class A Common Stock (in shares)	103,538	(88,911)
Net excess tax benefit from Equity-based compensation				(47)				(47)
Other				132				132
Balance at end of period at Jun. 30, 2016	$ 209	$ 311	$ (10,225)	$ 236,532	$ (37,958)	$ (140)	$ 38,911	$ 227,640
Balance at end of the period (in shares) at Jun. 30, 2016	20,890,320	31,138,551	(361,223)