Condensed Consolidated Statement of Changes in Equity - USD ($) $ in Thousands		Total	Total Stockholders' Equity	Common Stock	Additional Paid-in Capital	Retained Earnings/(Accumulated Deficit)	Non-controlling Interest	Common Stock		Common Stock Total Stockholders' Equity	Common Stock Common Stock	Common Stock Additional Paid-in Capital
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Preferred Stock, Value, Outstanding		$ 111,034
Beginning balance (in shares) at Dec. 31, 2019		38,647,943		38,647,943
Beginning balance at Dec. 31, 2019		$ 868,699	$ 829,265	$ 39	$ 821,747	$ (103,555)	$ 39,434
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(128,342)	(127,457)			(127,457)	(885)
Stock Issued During Period, Shares, New Issues	[1]							5,290,000
Stock Issued During Period, Value, New Issues	[1]							$ 95,292		$ 95,292	$ 5	$ 95,287
Shares Issued As Payment of Incentive Fee, Shares								637
Shares Issued As Payment of Incentive Fee								$ 12		12	0	12
Contributions from non-controlling interests		3,487					3,487
Dividends	[2]	(20,057)	(19,748)			(19,748)	(309)
Dividends, Preferred Stock, Cash	[3]	(1,941)	(1,941)			(1,941)
Distributions to non-controlling interests		(4,798)					(4,798)
Adjustment to non-controlling interests			(545)		(545)		545
Stock issued during period, shares, conversion of units				129,516
Stock Issued During Period, Value, Conversion of Units			2,378		2,378		(2,378)
Repurchase of shares of common stock (in shares)				(288,172)
Repurchase of shares of common stock		(3,035)	(3,035)		(3,035)						0
Share-based long term incentive plan unit awards		164	162		162		2
Ending balance (in shares) at Mar. 31, 2020				43,779,924
Ending balance at Mar. 31, 2020		$ 809,481	774,383	$ 44	916,006	(252,701)	35,098
Beginning balance (in shares) at Dec. 31, 2019		38,647,943		38,647,943
Beginning balance at Dec. 31, 2019		$ 868,699	829,265	$ 39	821,747	(103,555)	39,434
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ (38,201)
Stock Issued During Period, Shares, New Issues		5,290,000
Shares Issued As Payment of Incentive Fee, Shares		637
Repurchase of shares of common stock (in shares)		(290,050)
Repurchase of shares of common stock		$ (3,100)
Ending balance (in shares) at Sep. 30, 2020		43,781,684		43,781,684
Ending balance at Sep. 30, 2020		$ 872,277	835,130	$ 44	916,038	(191,986)	37,147
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Dividends declared (in usd per share)		$ 0.97
Preferred Stock, Value, Outstanding		$ 111,034
Beginning balance (in shares) at Mar. 31, 2020				43,779,924
Beginning balance at Mar. 31, 2020		809,481	774,383	$ 44	916,006	(252,701)	35,098
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		40,439	39,219			39,219	1,220
Contributions from non-controlling interests		2,895					2,895
Dividends	[2]	(11,097)	(10,945)			(10,945)	(152)
Dividends, Preferred Stock, Cash	[3]	(1,941)	(1,941)			(1,941)
Distributions to non-controlling interests		(2,280)					(2,280)
Share-based long term incentive plan unit awards		$ 182	180		180		2
Ending balance (in shares) at Jun. 30, 2020		43,779,924		43,779,924
Ending balance at Jun. 30, 2020		$ 837,679	800,896	$ 44	916,186	(226,368)	36,783
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Preferred Stock, Value, Outstanding		111,034
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 49,702	48,143			48,143	1,559
Stock Issued During Period, Shares, New Issues		0
Shares Issued As Payment of Incentive Fee, Shares		0
Contributions from non-controlling interests		$ 1,199					1,199
Dividends	[2]	(11,987)	(11,821)			(11,821)	(166)
Dividends, Preferred Stock, Cash	[3]	(1,940)	(1,940)			(1,940)
Distributions to non-controlling interests		$ (2,541)					(2,541)
Adjustment to non-controlling interests			(369)		(369)		369
Stock issued during period, shares, conversion of units				3,638
Stock Issued During Period, Value, Conversion of Units			59		59		(59)
Repurchase of shares of common stock (in shares)		(1,878)		(1,878)
Repurchase of shares of common stock		$ (21)	(21)		(21)						0
Share-based long term incentive plan unit awards		$ 186	183		183		3
Ending balance (in shares) at Sep. 30, 2020		43,781,684		43,781,684
Ending balance at Sep. 30, 2020		$ 872,277	835,130	$ 44	916,038	(191,986)	37,147
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Dividends declared (in usd per share)		$ 0.27
Preferred Stock, Dividends Per Share, Declared		$ 0.421875
Preferred Stock, Value, Outstanding		$ 111,034
Preferred Stock, Value, Outstanding		$ 111,034
Beginning balance (in shares) at Dec. 31, 2020		43,781,684		43,781,684
Beginning balance at Dec. 31, 2020		$ 921,572	885,215	$ 44	915,658	(141,521)	36,357
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		41,256	39,797			39,797	1,459
Contributions from non-controlling interests		1,517					1,517
Dividends	[2]	(13,334)	(13,134)			(13,134)	(200)
Dividends, Preferred Stock, Cash	[3]	(1,941)	(1,941)			(1,941)
Distributions to non-controlling interests		(5,923)					(5,923)
Adjustment to non-controlling interests			(307)		(307)		307
Share-based long term incentive plan unit awards		229	226		226		3
Ending balance (in shares) at Mar. 31, 2021				43,781,684
Ending balance at Mar. 31, 2021		$ 943,376	909,856	$ 44	915,577	(116,799)	33,520
Beginning balance (in shares) at Dec. 31, 2020		43,781,684		43,781,684
Beginning balance at Dec. 31, 2020		$ 921,572	885,215	$ 44	915,658	(141,521)	36,357
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 101,706
Stock Issued During Period, Shares, New Issues		7,852,900
Shares Issued As Payment of Incentive Fee, Shares		37,373
Repurchase of shares of common stock (in shares)		0
Ending balance (in shares) at Sep. 30, 2021		51,677,667		51,677,667
Ending balance at Sep. 30, 2021		$ 1,095,270	1,063,326	$ 52	1,057,939	(105,699)	31,944
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Dividends declared (in usd per share)		$ 1.19
Preferred Stock, Dividends Per Share, Declared		$ 0.84375
Preferred Stock, Value, Outstanding		$ 111,034
Beginning balance (in shares) at Mar. 31, 2021				43,781,684
Beginning balance at Mar. 31, 2021		943,376	909,856	$ 44	915,577	(116,799)	33,520
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		36,469	34,595			34,595	1,874
Contributions from non-controlling interests		5,931					5,931
Dividends	[2]	(19,563)	(19,265)			(19,265)	(298)
Dividends, Preferred Stock, Cash	[3]	(1,940)	(1,940)			(1,940)
Distributions to non-controlling interests		(9,413)					(9,413)
Share-based long term incentive plan unit awards		$ 244	240		240		4
Ending balance (in shares) at Jun. 30, 2021		43,781,684		43,781,684
Ending balance at Jun. 30, 2021		$ 955,104	923,486	$ 44	915,817	(103,409)	31,618
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Preferred Stock, Value, Outstanding		111,034
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 23,981	22,505			22,505	1,476
Stock Issued During Period, Shares, New Issues		7,852,900						7,852,900	[1]
Stock Issued During Period, Value, New Issues	[1]							$ 141,303		141,303	8	141,295
Shares Issued As Payment of Incentive Fee, Shares		37,373						37,373
Shares Issued As Payment of Incentive Fee								$ 716		$ 716	$ 0	$ 716
Contributions from non-controlling interests		$ 4,030					4,030
Dividends	[2]	(23,161)	(22,854)			(22,854)	(307)
Dividends, Preferred Stock, Cash	[3]	(1,941)	(1,941)			(1,941)
Distributions to non-controlling interests		$ (5,006)					(5,006)
Adjustment to non-controlling interests			(234)		(234)		234
Stock issued during period, shares, conversion of units				5,710
Stock Issued During Period, Value, Conversion of Units			105		105		(105)
Repurchase of shares of common stock (in shares)		0
Share-based long term incentive plan unit awards		$ 244	240		240		4
Ending balance (in shares) at Sep. 30, 2021		51,677,667		51,677,667
Ending balance at Sep. 30, 2021		$ 1,095,270	$ 1,063,326	$ 52	$ 1,057,939	$ (105,699)	$ 31,944
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Dividends declared (in usd per share)		$ 0.45
Preferred Stock, Dividends Per Share, Declared		$ 0.421875
Preferred Stock, Value, Outstanding		$ 111,034

[1] Net of underwriters' discounts and commissions and offering costs.

[2] For the three-month periods ended September 30, 2021 and 2020, dividends totaling $0.45 and $0.27, respectively, per share of common stock and convertible unit outstanding, were declared. For the nine-month periods ended September 30, 2021 and 2020, dividends totaling $1.19 and $0.97, respectively, per share of common stock and convertible unit outstanding, were declared.

[3] For each of the three-month periods ended September 30, 2021 and 2020 dividends totaling $0.421875 per share of preferred stock were declared. For the nine-month periods ended September 30, 2021 and 2020 dividends totaling $1.265625 and $0.84375, respectively, per share of preferred stock were declared.