Consolidated Statement of Changes In Equity (Unaudited) - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	6.75% Series C Cumulative Redeemable Perpetual Preferred Stock	Distributions in Excess of Accumulated Earnings	Non- controlling interests – Common OP Units	Accumulated Other Comprehensive Loss/(Income)
Balance at Dec. 31, 2016	$ 1,081,847	$ 854	$ 1,103,048	$ 136,144	$ (231,276)	$ 73,304	$ (227)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Common OP Units to Common Stock		13	16,429			(16,442)
Issuance of Common Stock through employee stock purchase plan	1,615		1,615
Issuance of Common Stock	42,037	5	42,032
Compensation expenses related to restricted stock	6,813		6,813
Adjustment for Common OP Unitholders in the Operating Partnership	0		(5,313)			5,313
Adjustment for fair market value of swap	227						227
Net income	162,403			7,667	144,911	9,825
Distributions	(142,900)			(6,910)	(127,406)	(8,584)
Series C Preferred stock redemption	(136,144)			(136,144)
Series C Preferred stock original issuance costs	0		757	(757)
Other	(723)		(723)		0
Balance at Sep. 30, 2017	$ 1,015,175	$ 872	$ 1,164,658	$ 0	$ (213,771)	$ 63,416	$ 0