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SUBSEQUENT EVENTS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 9 Months Ended 0 Months Ended 11 Months Ended
Sep. 10, 2013
Preferred stock
Jul. 08, 2013
Preferred stock
Apr. 05, 2013
Preferred stock
Jan. 11, 2013
Preferred stock
Dec. 14, 2012
Common stock
Aspire
Sep. 30, 2013
Common stock
Aspire
Nov. 14, 2013
Subsequent event
Common stock
Aspire
Nov. 15, 2013
Subsequent event
Common stock
Aspire
Subsequent events                
Cash dividend declared per share (in dollars per share) $ 0.15 $ 0.15 $ 0.15 $ 0.15        
Number of shares issued under purchase agreement         158,982 1,455,787 511,509 1,689,317
Purchase price for shares issued under purchase agreement         $ 1.0 $ 6.6 $ 2.0 $ 7.6
Additional shares committed for sale under agreement             3,042,038  
Period of common stock purchase agreement         2 years   2 years  
Common stock purchase agreement, additional amount committed             $ 18.0  
Shares issued under purchase agreement in lieu of commitment fee         74,548   166,105