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SUBSEQUENT EVENTS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Feb. 14, 2014
Subsequent event
Common Stock
Feb. 21, 2014
Subsequent event
Common Stock
Repurchase Agreements
Maximum
Feb. 21, 2014
Subsequent event
Common Stock
Repurchase Agreements
Minimum
Feb. 20, 2014
Subsequent event
Common Stock
Repurchase Agreements
Lead Investors
Feb. 20, 2014
Subsequent event
Common Stock
Repurchase Agreements
Carlyle
Feb. 20, 2014
Subsequent event
Common Stock
Repurchase Agreements
Carlyle
Maximum
Feb. 20, 2014
Subsequent event
Common Stock
Repurchase Agreements
Anchorage
Feb. 20, 2014
Subsequent event
Common Stock
Repurchase Agreements
Anchorage
Maximum
Feb. 21, 2014
Subsequent event
Forecast
Common Stock
Feb. 21, 2014
Subsequent event
Forecast
Common Stock
Maximum
Feb. 21, 2014
Subsequent event
Forecast
Common Stock
Minimum
Subsequent events                          
Tender offer price (in dollars per share)       $ 21.00 $ 18.50                
Purchase price after the expiration date of the Tender Offer (in dollars per share)                       $ 21.00 $ 18.50
Increment in purchase price after the expiration date of the Tender Offer (in dollars per share)                     $ 0.10    
Common stock, issued shares 42,107,633 41,867,046 42,108,496                    
Common stock, outstanding shares 42,107,633 41,867,046 42,108,496                    
Number of shares repurchased or acquired through tender offer       3,718,918 3,276,190             5,952,380 6,756,755
Shares offered to purchase pursuant to the tender offer as a percentage of shares issued and outstanding, if tender offer is fully subscribed       8.80% 7.80%                
Number of shares of common stock held by investors             9,463,095   9,463,095        
Percentage of shares of common stock held by investors           44.90% 22.50%   22.50%        
Value of shares repurchased or acquired through tender offer       $ 68.8   $ 56.2   $ 28.1   $ 28.1   $ 125.0  
Purchase price, if the tender offer is fully subscribed (in dollars per share)                       $ 21.00 $ 18.50
Share repurchase percentage of issued and outstanding shares, if the tender offer and share repurchase is fully subscribed at maximum purchase price                     14.10%    
Share repurchase percentage of issued and outstanding shares, if the tender offer and share repurchase is fully subscribed at minimum purchase price                     16.00%