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EQUITY-BASED COMPENSATION (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Estimated forfeiture rate (as a percent)     3.00%    
Equity instruments other than options, Units outstanding (in shares) 2,737,274   2,737,274   2,297,652
Weighted average fair value of restricted shares per share granted (in dollars per share)     $ 9.87 $ 12.23  
Aggregate fair value of stock vested $ 1.9 $ 1.0 $ 7.3 $ 6.2  
Shares issued relating to vesting of restricted stock awards (in shares)     506,576   626,928
Value of unvested restricted stock $ 19.6   $ 19.6    
Weighted-average recognition period for unvested restricted stock (in years)     1 year 11 months    
2014 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized 4,959,944   4,959,944    
2000 Directors Stock Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized 1,900,000   1,900,000    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity instruments other than options, Units outstanding (in shares) 166,250   166,250   134,591