Condensed 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, 2018	$ 371,753	$ 470	$ 105	$ (56,661)	$ 697,938	$ (237,782)	$ 291	$ (32,608)
Balance at beginning of the period (in shares) at Dec. 31, 2018		47,031,095	10,493,358	(1,426,115)
Changes in Equity
Net income (loss)	16,177					13,570		2,607
Equity-based compensation	38,886	$ 24			38,753			109
Equity-based compensation (in shares)		2,397,164
Other comprehensive income (loss)	540						421	119
Dividends declared and distributions	(114,391)				19,484	(103,436)		(30,439)
Treasury Stock Purchases	(26,970)			$ (26,970)
Treasury stock purchases (in shares)				(616,796)
Exercise of Stock options	492				492
Exercise of stock options (in shares)		29,439
Equity-based payments to non-employees	416				416
Other	240				(734)			974
Balance at end of the period at Mar. 31, 2019	287,143	$ 494	$ 105	$ (83,631)	756,349	(327,648)	712	(59,238)
Balance at end of the period (in shares) at Mar. 31, 2019		49,457,698	10,493,358	(2,042,911)
Balance at beginning of the period at Dec. 31, 2018	371,753	$ 470	$ 105	$ (56,661)	697,938	(237,782)	291	(32,608)
Balance at beginning of the period (in shares) at Dec. 31, 2018		47,031,095	10,493,358	(1,426,115)
Changes in Equity
Net income (loss)	53,844
Treasury Stock Purchases	$ (39,610)
Treasury stock purchases (in shares)	(971,835)
Balance at end of the period at Jun. 30, 2019	$ 312,858	$ 516	$ 104	$ (96,271)	791,403	(327,353)	667	(56,208)
Balance at end of the period (in shares) at Jun. 30, 2019		51,629,289	10,431,422	(2,397,950)
Balance at beginning of the period at Mar. 31, 2019	287,143	$ 494	$ 105	$ (83,631)	756,349	(327,648)	712	(59,238)
Balance at beginning of the period (in shares) at Mar. 31, 2019		49,457,698	10,493,358	(2,042,911)
Changes in Equity
Net income (loss)	37,667					29,459		8,208
Equity-based compensation	28,246	$ 18			28,187			41
Equity-based compensation (in shares)		1,787,993
Other comprehensive income (loss)	(57)						(45)	(12)
Dividends declared and distributions	(31,146)				4,514	(29,164)		(6,496)
Treasury Stock Purchases	(12,640)			$ (12,640)
Treasury stock purchases (in shares)				(355,039)
Exercise of Stock options	5,375	$ 3			5,372
Exercise of stock options (in shares)		321,662
Issuance of Class A common stock and cancellation of Class B common stock in connection with offerings and other exchanges	430	$ 1	$ (1)		(1,580)			2,010
Issuance of Class A common stock and cancellation of Class B common stock in connection with offerings and other exchanges (in shares)		61,936	(61,936)
Equity-based payments to non-employees	111				111
Other	(2,271)				(1,550)			(721)
Balance at end of the period at Jun. 30, 2019	312,858	$ 516	$ 104	$ (96,271)	791,403	(327,353)	667	(56,208)
Balance at end of the period (in shares) at Jun. 30, 2019		51,629,289	10,431,422	(2,397,950)
Balance at beginning of the period at Dec. 31, 2019	393,827	$ 528	$ 104	$ (107,836)	872,791	(324,192)	1,432	(49,000)
Balance at beginning of the period (in shares) at Dec. 31, 2019		52,773,617	10,397,915	(2,757,558)
Cumulative effect adjustment upon adoption of ASU 2016-13 (ASU 2016-13) at Dec. 31, 2019	(364)					(364)
Balance at beginning of the period, as adjusted at Dec. 31, 2019	393,463	$ 528	$ 104	$ (107,836)	872,791	(324,556)	1,432	(49,000)
Changes in Equity
Net income (loss)	30,126					25,130		4,996
Equity-based compensation	38,255	$ 36			38,189			30
Equity-based compensation (in shares)		3,581,294
Other comprehensive income (loss)	(1,630)						(1,304)	(326)
Dividends declared and distributions	(88,689)				12,125	(79,391)		(21,423)
Treasury Stock Purchases	(31,636)			$ (31,636)
Treasury stock purchases (in shares)				(869,779)
Exercise of Stock options	11,819	$ 7			11,812
Exercise of stock options (in shares)		721,484
Equity-based payments to non-employees	158				158
Other	690				(1,981)			2,671
Balance at end of the period at Mar. 31, 2020	352,556	$ 571	$ 104	$ (139,472)	933,094	(378,817)	128	(63,052)
Balance at end of the period (in shares) at Mar. 31, 2020		57,076,395	10,397,915	(3,627,337)
Balance at beginning of the period at Dec. 31, 2019	393,827	$ 528	$ 104	$ (107,836)	872,791	(324,192)	1,432	(49,000)
Balance at beginning of the period (in shares) at Dec. 31, 2019		52,773,617	10,397,915	(2,757,558)
Cumulative effect adjustment upon adoption of ASU 2016-13 (ASU 2016-13) at Dec. 31, 2019	(364)					(364)
Balance at beginning of the period, as adjusted at Dec. 31, 2019	393,463	$ 528	$ 104	$ (107,836)	872,791	(324,556)	1,432	(49,000)
Changes in Equity
Net income (loss)	21,082
Treasury Stock Purchases	$ (32,402)
Treasury stock purchases (in shares)	(894,398)
Balance at end of the period at Jun. 30, 2020	$ 360,643	$ 589	$ 87	$ (140,238)	961,326	(401,137)	50	(60,034)
Balance at end of the period (in shares) at Jun. 30, 2020		58,897,917	8,655,509	(3,651,956)
Balance at beginning of the period at Mar. 31, 2020	352,556	$ 571	$ 104	$ (139,472)	933,094	(378,817)	128	(63,052)
Balance at beginning of the period (in shares) at Mar. 31, 2020		57,076,395	10,397,915	(3,627,337)
Changes in Equity
Net income (loss)	(9,044)					(5,732)		(3,312)
Equity-based compensation	29,379	$ 1			29,369			9
Equity-based compensation (in shares)		72,616
Other comprehensive income (loss)	(95)						(78)	(17)
Dividends declared and distributions	(17,081)				2,496	(16,588)		(2,989)
Treasury Stock Purchases	(766)			$ (766)
Treasury stock purchases (in shares)				(24,619)
Exercise of Stock options	104				104
Exercise of stock options (in shares)		6,500
Issuance of Class A common stock and cancellation of Class B common stock in connection with offerings and other exchanges	4,939	$ 17	$ (17)		(4,388)			9,327
Issuance of Class A common stock and cancellation of Class B common stock in connection with offerings and other exchanges (in shares)		1,742,406	(1,742,406)
Equity-based payments to non-employees	651				651
Balance at end of the period at Jun. 30, 2020	$ 360,643	$ 589	$ 87	$ (140,238)	$ 961,326	$ (401,137)	$ 50	$ (60,034)
Balance at end of the period (in shares) at Jun. 30, 2020		58,897,917	8,655,509	(3,651,956)