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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS Noncontrolling Interest (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
$ / Units
shares
Sep. 30, 2015
$ / shares
Jun. 30, 2015
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
$ / Units
shares
Sep. 30, 2014
$ / shares
Jun. 30, 2014
$ / shares
Mar. 31, 2014
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
$ / Units
shares
Dec. 31, 2014
USD ($)
$ / shares
$ / Units
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       $ 380,416,000         $ 380,416,000    
Net income for the period January 1 through December 31, 2015                 84,262,000 $ 81,082,000 $ 4,525,000
Conversion of 100,620 OP Units to Common Shares by limited partners of the Operating Partnership                 0 0 0
Other comprehensive income - unrealized loss on valuation of swap agreements                 (5,061,000) (9,061,000) 3,610,000
Reclassification of realized interest on swap agreements                 5,524,000 3,776,000 2,892,000
Noncontrolling interest contributions                 35,489,000 57,969,000 49,324,000
Noncontrolling interest distributions and other reductions                 (74,950,000) (218,152,000) (87,688,000)
Employee Long-term Incentive Plan Unit Awards                 8,644,000 8,460,000 $ 7,672,000
Balance $ 420,866,000       $ 380,416,000       $ 420,866,000 $ 380,416,000  
Distributions declared (in dollars per share) | $ / shares $ 0.50 $ 0.24 $ 0.24 $ 0.24 $ 0.54 $ 0.23 $ 0.23 $ 0.23 $ 1.22 $ 1.23 $ 0.86
Limited partners' capital account, units issued and converted (in shares) | shares 100,620               100,620    
Units converted from Series A Preferred OP Units (in shares) | shares 185,600               185,600    
Denominator for Series A Preferred OP Unit conversion $ 7.50               $ 7.50    
LTIP Units [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
LTIP units outstanding (in shares) | shares 1,922,623       1,719,206       1,922,623 1,719,206  
Series A Preferred Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Per unit conversion amount, Series A Preferred OP Units (in dollars per unit) | $ / Units 22.50               22.50    
Per unit conversion annual rate, Series A Preferred OP Units 9.00%               9.00%    
Limited partners' capital account, units issued and converted (in shares) | shares 1,392               1,392    
Noncontrolling Interests                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Conversion of 100,620 OP Units to Common Shares by limited partners of the Operating Partnership                 $ (2,451,000) $ (3,181,000) $ (1,548,000)
Other comprehensive income - unrealized loss on valuation of swap agreements                 (1,014,000) (1,247,000) 69,000
Reclassification of realized interest on swap agreements                 1,935,000 1,099,000 994,000
Noncontrolling interest contributions                 35,489,000 57,969,000 49,324,000
Noncontrolling interest distributions and other reductions                 (74,950,000) (218,152,000) (87,688,000)
Employee Long-term Incentive Plan Unit Awards                 6,723,000 6,528,000 $ 6,530,000
Noncontrolling Interests | Partially-Owned Affiliates [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       $ 286,181,000         286,181,000    
Distributions declared of $1.22 per Common OP Unit                 0    
Net income for the period January 1 through December 31, 2015                 80,426,000    
Conversion of 100,620 OP Units to Common Shares by limited partners of the Operating Partnership                 0    
Other comprehensive income - unrealized loss on valuation of swap agreements                 (897,000)    
Reclassification of realized interest on swap agreements                 1,838,000    
Noncontrolling interest contributions                 35,489,000    
Noncontrolling interest distributions and other reductions                 (78,511,000)    
Employee Long-term Incentive Plan Unit Awards                 0    
Balance $ 324,526,000       $ 286,181,000       $ 324,526,000 $ 286,181,000  
Operating Partnership, as General Partner or Managing Member [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Series A Preferred OP Units (in shares) | shares 2,931,198       2,988,277       2,931,198 2,988,277  
Operating Partnership, as General Partner or Managing Member [Member] | Series A Preferred Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Series A Preferred OP Units (in shares) | shares 188       188       188 188 188
Limited partners' capital account, value per unit (in dollars per unit) | $ / Units 1,000       1,000       1,000 1,000  
Operating Partnership, as General Partner or Managing Member [Member] | Noncontrolling Interests                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       $ 94,235,000         $ 94,235,000    
Distributions declared of $1.22 per Common OP Unit                 (5,983,000)    
Net income for the period January 1 through December 31, 2015                 3,836,000    
Conversion of 100,620 OP Units to Common Shares by limited partners of the Operating Partnership                 (2,451,000)    
Other comprehensive income - unrealized loss on valuation of swap agreements                 (117,000)    
Reclassification of realized interest on swap agreements                 97,000    
Noncontrolling interest contributions                 0    
Noncontrolling interest distributions and other reductions                 0    
Employee Long-term Incentive Plan Unit Awards                 6,723,000    
Balance $ 96,340,000       $ 94,235,000       $ 96,340,000 $ 94,235,000