CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Parent	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interest
Balance at Dec. 31, 2013	$ 1,121,588	$ 704,236	$ 56	$ 665,301	$ 1,132	$ 37,747	$ 417,352
Balance (in Shares) at Dec. 31, 2013	55,643,068		55,643,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)			27,000
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	0	648	0	648	0	0	(648)
Issuance of Common Shares, net of issuance costs (in Shares)			3,410,000
Issuance of Common Shares, net of issuance costs	90,957	90,957	3	90,954	0	0	0
Dividends declared ($0.46 per Common Share)	(28,097)	(26,604)	0	0	0	(26,604)	(1,493)
Vesting of employee Restricted Share and LTIP awards (in Shares)			72,000
Vesting of employee Restricted Share and LTIP awards	4,546	1,138	0	1,138	0	0	3,408
Noncontrolling interest distributions	(55,323)	0	0	0	0	0	(55,323)
Noncontrolling Interest, Increase from Contributions	31,046	0	0	0	0	0	31,046
Balance before adjustment towards comprehensive income (in Shares)			59,152,000
Balance before adjustment towards comprehensive income	1,164,717	770,375	59	758,041	1,132	11,143	394,342
Comprehensive (loss) income:
Net income (loss)	30,983	33,059	0	0	0	33,059	(2,076)
Unrealized (loss) income on valuation of swap agreements	(5,112)	(5,595)	0	0	(5,595)	0	483
Reclassification of realized interest on swap agreements	1,773	2,387	0	0	2,387	0	(614)
Comprehensive income	27,644	29,851	0	0	(3,208)	33,059	(2,207)
Balance at Jun. 30, 2014	$ 1,192,361	$ 800,226	$ 59	$ 758,041	$ (2,076)	$ 44,202	$ 392,135
Balance (in Shares) at Jun. 30, 2014	59,151,817		59,152,000