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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS Noncontrolling Interest (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 29, 2011 | Feb. 27, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 LTIP Units [Member] | Dec. 31, 2011 LTIP Units [Member] | Dec. 31, 2011 Klaff [Member] Restricted Stock [Member] | Dec. 31, 2005 Klaff [Member] Restricted Stock [Member] | Dec. 31, 2012 Series A Preferred Stock [Member] | Dec. 31, 2012 Noncontrolling Interests | Dec. 31, 2011 Noncontrolling Interests | Dec. 31, 2010 Noncontrolling Interests | Dec. 31, 2012 Noncontrolling Interests Partially-Owned Affiliates [Member] | Dec. 31, 2012 Operating Partnership, as General Partner or Managing Member [Member] | Dec. 31, 2011 Operating Partnership, as General Partner or Managing Member [Member] | Dec. 31, 2012 Operating Partnership, as General Partner or Managing Member [Member] Series A Preferred Stock [Member] | Dec. 31, 2011 Operating Partnership, as General Partner or Managing Member [Member] Series A Preferred Stock [Member] | Dec. 31, 2012 Operating Partnership, as General Partner or Managing Member [Member] Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  | $ 385,195,000 |  |  |  |  | $ 385,195,000 |  |  |  |  |  |  |  |  |  |  | $ 375,203,000 |  |  |  |  | $ 9,992,000
Distributions declared of $0.72 per Common OP Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | (1,098,000)
Distributions declared | $ 0.18 | $ 0.21 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.72 | $ 0.72 | $ 0.72 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period January 1 through December 31, 2012 |  |  |  |  |  |  |  |  |  |  | 50,230,000 | 2,160,000 | 20,610,000 |  |  |  |  |  |  |  |  | 49,702,000 |  |  |  |  | 528,000
Conversion of 334,445 OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,880,000) | (56,000) | (3,240,000) | 0 |  |  |  |  | (5,880,000)
Issuance of LTIP Unit awards to employees |  |  |  |  |  |  |  |  |  |  | 2,577,000 | 2,441,000 |  |  |  |  |  |  | 2,577,000 | 2,441,000 |  | 0 |  |  |  |  | 2,577,000
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  |  |  | 2,279,000 | 0 | 0 |  |  |  |  |  | 2,279,000 |  |  | 0 |  |  |  |  | 2,279,000
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  |  |  | (3,519,000) | (5,611,000) | (2,683,000) |  |  |  |  |  | (1,704,000) | (2,150,000) | (354,000) | (1,632,000) |  |  |  |  | (72,000)
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  |  |  | (2,268,000) | (3,081,000) | (2,749,000) |  |  |  |  |  | (847,000) | (676,000) | (283,000) | 827,000 |  |  |  |  | 20,000
Noncontrolling Interest contributions |  |  |  |  |  |  |  |  |  |  | 172,228,000 | 117,945,000 | 33,556,000 |  |  |  |  |  | 172,228,000 | 117,945,000 | 33,556,000 | 172,228,000 |  |  |  |  | 0
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  |  |  | (160,663,000) | (7,697,000) | (2,892,000) |  |  |  |  |  | (160,663,000) | (7,697,000) | (2,892,000) | (160,663,000) |  |  |  |  | 0
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  |  |  | 3,640,000 | 4,032,000 | 3,838,000 |  |  |  |  |  | 3,448,000 | 3,550,000 | 1,778,000 | 0 |  |  |  |  | 3,448,000
Balance |  |  | 447,459,000 |  |  |  | 385,195,000 |  |  |  | 447,459,000 | 385,195,000 |  |  |  |  |  |  |  |  |  | 435,665,000 |  |  |  |  | 11,794,000
Series A Preferred OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 284,097 | 279,748 | 188 | 188 |
Limited Partners' Capital Account, Value Per Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 | 1,000 |
Per Unit Conversion Amount, Series A Preferred OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22.50 |  |  |  |  |  |  |  |  |
Per Unit Conversion Annual Rate, Series A Preferred OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |
Share-based Compensation, Units Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,109,727 | 1,061,564 |  |  |  |  |  |  |  |  |  |  |  |
Units issued for interest in contractual rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |
Units issued for interest in contractual rights, converted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |
Limited Partners' Capital Account, Units Issued and Converted |  |  | 334,445 |  |  |  |  |  |  |  | 334,445 |  |  |  |  |  |  | 1,392 |  |  |  |  |  |  |  |  |
Share-based Compensation, Units converted from Series A Preferred OP Units |  |  |  |  |  |  | 185,600 |  |  |  |  | 185,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for Series A Preferred OP Unit Conversion |  |  | $ 7.50 |  |  |  |  |  |  |  | $ 7.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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