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NET INCOME PER COMMON SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2013
Series A Units
Sep. 30, 2013
Series B Units
Sep. 30, 2013
Operating Partnership
Series B Units
Sep. 30, 2013
Operating Partnership
Notes
Jun. 21, 2013
Operating Partnership
Notes
Net income per common share              
Principal amount of notes           $ 250,000  
Interest rate (as a percent)           2.375% 2.375%
Exchange price (in dollars per share)           $ 55.69  
Shares related to the Notes included in the computation for diluted earnings per share 0 0          
Exchangeable preferred operating partnership units settled in cash, minimum     115,000        
Units outstanding (in dollars)       $ 33,568 $ 33,568    
Closing price (in dollars per share) $ 45.75 $ 45.75          
Number of shares which would have been issued upon assuming conversion       733,731