Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Real estate, accumulated depreciation	[1]	$ 198,326	$ 168,480
Deferred financing costs, accumulated amortization		33,769	26,056
Intangible assets, accumulated amortization		$ 26,307	$ 13,911
Preferred shares, authorized		25,000,000	25,000,000
Cumulative redeemable preferred shares, shares issued		4,000,000
Common shares, par value		$ 0.03	$ 0.03
Common shares, shares authorized		200,000,000	200,000,000
Common shares, shares issued		91,586,767	82,506,606
Common shares, shares outstanding		91,586,767	82,506,606
Unvested restricted common share awards		742,764	541,575
Series D Cumulative Redeemable Preferred Stock
Series D cumulative redeemable preferred shares, par value		$ 0.01	$ 0.01
Series D cumulative redeemable preferred shares, shares authorized		4,000,000	4,000,000
Series D cumulative redeemable preferred shares, shares issued		4,000,000	4,000,000
Series D cumulative redeemable preferred shares, shares outstanding		4,000,000	4,000,000
7.75% Series A cumulative redeemable preferred shares
Preferred shares, authorized		8,069,288	8,069,288
Preferred shares, dividend rate		7.75%	7.75%
Cumulative redeemable preferred shares, liquidation preference		$ 25.00	$ 25.00
Cumulative redeemable preferred shares, shares issued		5,306,084	4,775,569
Cumulative redeemable preferred shares, shares outstanding		5,306,084	4,775,569
Preferred shares, par value		$ 0.01	$ 0.01
8.375% Series B cumulative redeemable preferred shares
Preferred shares, authorized		4,300,000	4,300,000
Preferred shares, dividend rate		8.375%	8.375%
Cumulative redeemable preferred shares, liquidation preference		$ 25.00	$ 25.00
Cumulative redeemable preferred shares, shares issued		2,340,969	2,288,465
Cumulative redeemable preferred shares, shares outstanding		2,340,969	2,288,465
Preferred shares, par value		$ 0.01	$ 0.01
Series C Cumulative Redeemable Preferred Stock
Preferred shares, authorized		3,600,000	3,600,000
Preferred shares, dividend rate		8.875%	8.875%
Cumulative redeemable preferred shares, liquidation preference		$ 25.00	$ 25.00
Cumulative redeemable preferred shares, shares issued		1,640,425	1,640,100
Cumulative redeemable preferred shares, shares outstanding		1,640,425	1,640,100
Preferred shares, par value		$ 0.01	$ 0.01
Series E cumulative redeemable preferred shares
Preferred shares, authorized		4,000,000	4,000,000
Preferred shares, par value		$ 0.01	$ 0.01

[1] As of December 31, 2015, includes properties owned by IRT, with a book value of $1,372,015 and accumulated depreciation of $39,638. As of December 31, 2014, includes properties owned by IRT with a book value of $689,112 and accumulated depreciation of $23,376