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CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total Shareholders' Equity	Common Shares	Preferred Shares	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss)	Accumulated Deficit	Noncontrolling Interest in Subsidiaries	Operating Partnership Interests of third parties	Total
Balance of Noncontrolling Interests in the Operating Partnership at Dec. 31, 2011								$ 49,732
Balance at Dec. 31, 2011	955,913	1,221	31	1,309,505	(12,831)	(342,013)	39,409		995,322
Balance (in shares) at Dec. 31, 2011		122,059,000	3,100,000
Increase (Decrease) in Stockholders' Equity
Issuance of common shares, net	102,079	79		102,000					102,079
Issuance of common shares, net (in shares)		7,900,000
Issuance of restricted shares	2	2							2
Issuance of restricted shares (in shares)		246,000
Conversion from units to shares	19,247	14		19,233				(19,247)	19,247
Conversion from units to shares (in shares)		1,380,000
Exercise of stock options	1,629	2		1,627					1,629
Exercise of stock options (in shares)		210,000
Amortization of restricted shares	3,352			3,352					3,352
Share compensation expense	1,198			1,198					1,198
Acquisition of noncontrolling interest	(18,452)			(18,452)			(38,532)	(132)	(56,984)
Adjustment for noncontrolling interest in the Operating Partnership	(19,520)					(19,520)		19,520	(19,520)
Net income (loss)	1,817					1,817	1,918	(107)	(4,191)
Net income (loss), including temporary equity									3,735
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	(7,124)				(7,124)			(342)	(7,124)
Unrealized (loss) gain on foreign currency translation	159				159		9	4	168
Preferred share distributions	(6,008)					(6,008)			(6,008)us-gaap_DividendsPreferredStock
Common share distributions	(44,501)					(44,501)	(2,686)	(1,438)	(47,187)us-gaap_DividendsCommonStock
Balance of Noncontrolling Interests in the Operating Partnership at Dec. 31, 2012								47,990
Balance at Dec. 31, 2012	989,791	1,318	31	1,418,463	(19,796)	(410,225)	118		989,909
Balance (in shares) at Dec. 31, 2012		131,795,000	3,100,000
Increase (Decrease) in Stockholders' Equity
Contributions from noncontrolling interests in subsidiaries							831		831
Issuance of common shares, net	100,287	57		100,230					100,287
Issuance of common shares, net (in shares)		5,700,000
Issuance of restricted shares	3	3							3
Issuance of restricted shares (in shares)		301,000
Conversion from units to shares	14,698	10		14,688				(14,698)	14,698
Conversion from units to shares (in shares)		1,018,000
Exercise of stock options	3,710	5		3,705					3,710
Exercise of stock options (in shares)		514,000
Amortization of restricted shares	4,747			4,747					4,747
Share compensation expense	870			870					870
Adjustment for noncontrolling interest in the Operating Partnership	(3,292)					(3,292)		3,292	(3,292)
Net income (loss)	41,448					41,448	(42)	588	35,440
Net income (loss), including temporary equity									41,406
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	8,751				8,751			151	8,751
Unrealized (loss) gain on foreign currency translation	31				31		24	1	55
Preferred share distributions	(6,008)					(6,008)			(6,008)us-gaap_DividendsPreferredStock
Common share distributions	(62,760)					(62,760)		(1,049)	(62,760)us-gaap_DividendsCommonStock
Balance of Noncontrolling Interests in the Operating Partnership at Dec. 31, 2013								36,275	36,275
Balance at Dec. 31, 2013	1,092,276	1,393	31	1,542,703	(11,014)	(440,837)	931		1,093,207
Balance (in shares) at Dec. 31, 2013		139,328,000	3,100,000
Increase (Decrease) in Stockholders' Equity
Contributions from noncontrolling interests in subsidiaries							642		642
Issuance of common shares, net	416,001	227		415,774					416,001
Issuance of common shares, net (in shares)		22,704,000
Issuance of restricted shares	5	5							5
Issuance of restricted shares (in shares)		482,000
Conversion from units to shares	308			308				(308)	308
Conversion from units to shares (in shares)		18,000
Exercise of stock options	13,802	14		13,788					13,802
Exercise of stock options (in shares)		1,425,000
Amortization of restricted shares	182			182					182
Share compensation expense	1,553			1,553					1,553
Adjustment for noncontrolling interest in the Operating Partnership	(14,761)					(14,761)		14,761	(14,761)
Net income (loss)	26,379					26,379	16	307	20,371
Net income (loss), including temporary equity									26,395
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	2,427				2,427			37	2,427
Unrealized (loss) gain on foreign currency translation	(172)				(172)		3	(6)	(169)
Preferred share distributions	(6,008)					(6,008)			(6,008)us-gaap_DividendsPreferredStock
Common share distributions	(83,966)					(83,966)		(1,243)	(83,966)us-gaap_DividendsCommonStock
Balance of Noncontrolling Interests in the Operating Partnership at Dec. 31, 2014								49,823	49,823
Balance at Dec. 31, 2014	$ 1,448,026	$ 1,639	$ 31	$ 1,974,308	$ (8,759)	$ (519,193)	$ 1,592		$ 1,449,618
Balance (in shares) at Dec. 31, 2014		163,957,000	3,100,000