Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit) and Distributions	Total Stockholders’ Equity	Non-controlling Interests in Operating Partnership
Balance at beginning of year at Dec. 31, 2017	$ 1,277,376	$ 128	$ 1,043	$ 1,262,679	$ 1,451	$ 9,201	$ 1,274,502	$ 2,874
Balance (in shares) at Dec. 31, 2017		12,800,000	104,287,128
Changes in equity
Redemption of preferred stock	(85,000)	$ (34)		(81,689)		(3,277)	(85,000)
Redemption of preferred stock (in shares)		(3,400,000)
Dividends	(24,380)					(24,322)	(24,322)	(58)
Equity-based compensation	2,227		$ 6	2,214			2,220	7
Equity-based compensation (in shares)			584,520
Shares acquired for employee withholding requirements	$ (2,724)		$ (2)	(2,722)			(2,724)
Shares acquired for employee withholding requirements (in shares)	(187,850)		(187,850)
Other	$ (61)			(61)			(61)
Other comprehensive loss	3,744				3,732		3,732	12
Net income	9,691					9,688	9,688	3
Balance at end of year at Mar. 31, 2018	1,180,873	$ 94	$ 1,047	1,180,421	5,183	(8,710)	1,178,035	2,838
Balance (in shares) at Mar. 31, 2018		9,400,000	104,683,798
Balance at beginning of year at Dec. 31, 2018	1,192,144	$ 94	$ 1,048	1,185,310	(1,441)	4,838	1,189,849	2,295
Balance (in shares) at Dec. 31, 2018		9,400,000	104,783,179
Changes in equity
Dividends	(22,003)					(21,956)	(21,956)	(47)
Equity-based compensation	1,352		$ 4	1,345			1,349	3
Equity-based compensation (in shares)			370,826
Shares acquired for employee withholding requirements	$ (834)		$ (1)	(833)			(834)
Shares acquired for employee withholding requirements (in shares)	(73,892)		(73,892)
Other	$ (32)			(32)			(32)
Other comprehensive loss	(5,558)				(5,544)		(5,544)	(14)
Net income	12,900					12,877	12,877	23
Balance at end of year at Mar. 31, 2019	$ 1,177,969	$ 94	$ 1,051	$ 1,185,790	$ (6,985)	$ (4,241)	$ 1,175,709	$ 2,260
Balance (in shares) at Mar. 31, 2019		9,400,000	105,080,113