Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	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
Balance at beginning of the period at Dec. 31, 2015	$ 257,418	$ 205	$ 312	$ (7,616)	$ 190,703	$ (15,338)	$ 108	$ 89,044
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)	141,865					38,387		103,478
Equity-based compensation	77,050	$ 4			73,914			3,132
Equity-based compensation (in shares)		308,720	(2,132)
Other comprehensive income (loss)	(1,734)						(651)	(1,083)
Dividends declared and distributions	(222,769)				23,367	(91,278)		(154,858)
Treasury stock purchases	(3,314)			$ (3,314)
Treasury stock purchases (in shares)				(124,268)
Class A Partnership Units and other equity purchased or converted to Class A Common stock	835	$ 1	$ (1)		952			(117)
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 (detriment) from equity-based compensation	(62)				(62)
Other	2,152				2,152
Balance at end of the period at Dec. 31, 2016	251,441	$ 210	$ 311	$ (10,930)	291,026	(68,229)	(543)	39,596
Balance at end of the period (in shares) at Dec. 31, 2016		20,948,998	31,138,193	(387,890)
Cumulative Effect Adjustment upon Adoption of ASU (ASU 2016-09) at Dec. 31, 2016	658				4,855	(4,197)
Balance at beginning of the period, as adjusted at Dec. 31, 2016	252,099	$ 210	$ 311	$ (10,930)	295,881	(72,426)	(543)	39,596
Changes in Equity
Net income (loss)	126,524					29,400		97,124
Equity-based compensation	96,295	$ 17			94,141			2,137
Equity-based compensation (in shares)		1,708,826
Other comprehensive income (loss)	1,827						895	932
Other comprehensive income (loss) | ASU 2016-01	317
Dividends declared and distributions	(187,628)				24,657	(96,892)		(115,393)
Treasury stock purchases	$ (12,258)			$ (12,258)
Treasury stock purchases (in shares)	(319,526)			(319,526)
Exercise of Stock options	$ 6,055	$ 3			6,052
Exercise of stock options (in shares)		279,277
Issuance of Class A common stock and cancellation of Class B common stock in connection with offerings and other exchanges	55,672	$ 112	$ (112)		60,762			(5,090)
Issuance of Class A common stock and cancellation of Class B common stock in connection with offerings and other exchanges (in shares)		11,226,067	(11,225,963)
Equity-based payments to non-employees	5,615				5,615
Other	55				55
Other (in shares)		(126)
Balance at end of the period at Dec. 31, 2017	344,256	$ 342	$ 199	$ (23,188)	487,163	(139,918)	352	19,306
Balance at end of the period (in shares) at Dec. 31, 2017		34,163,042	19,912,230	(707,416)
Cumulative Effect Adjustment upon Adoption of ASU (ASU 2014-09) at Dec. 31, 2017	3,155					3,155
Cumulative Effect Adjustment upon Adoption of ASU (ASU 2016-01) at Dec. 31, 2017						(317)	317
Balance at beginning of the period, as adjusted at Dec. 31, 2017	347,411	$ 342	$ 199	$ (23,188)	487,163	(137,080)	669	19,306
Changes in Equity
Net income (loss)	208,004					140,680		67,324
Equity-based compensation	123,037	$ 31			121,883			1,123
Equity-based compensation (in shares)		3,123,395
Other comprehensive income (loss)	(453)						(378)	(75)
Dividends declared and distributions	(313,827)				49,601	(241,382)		(122,046)
Treasury stock purchases	$ (33,473)			$ (33,473)
Treasury stock purchases (in shares)	(718,699)			(718,699)
Exercise of Stock options	$ 6,846	$ 3			6,843
Exercise of stock options (in shares)		351,904
Issuance of Class A common stock and cancellation of Class B common stock in connection with offerings and other exchanges	30,608	$ 94	$ (94)		28,171			2,437
Issuance of Class A common stock and cancellation of Class B common stock in connection with offerings and other exchanges (in shares)		9,392,754	(9,392,754)
Equity-based payments to non-employees	4,277				4,277
Other	(677)							(677)
Other (in shares)			(26,118)
Balance at end of the period at Dec. 31, 2018	$ 371,753	$ 470	$ 105	$ (56,661)	$ 697,938	$ (237,782)	$ 291	$ (32,608)
Balance at end of the period (in shares) at Dec. 31, 2018		47,031,095	10,493,358	(1,426,115)