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COMPENSATION PROGRAMS - Schedule of Restricted Stock Awards (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2014
Feb. 29, 2016
Jan. 31, 2016
Jan. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares)         35,000    
Grant date fair value per share (in dollars per share)         $ 11.41    
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Unvested stock awards outstanding at beginning of period (in shares)     288,861 436,581 436,581    
Grants (in shares)         35,000    
Forfeitures (in shares)         (22,499)    
Vestings (in shares)         (160,221)    
Unvested stock awards outstanding at end of period (in shares)         288,861 436,581  
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Unvested stock awards outstanding at beginning of period (in dollars per share)     $ 11.98 $ 12.29 $ 12.29    
Grants (in dollars per share)         11.41    
Forfeitures (in dollars per share)         12.00    
Vestings (in dollars per share)         12.71    
Unvested stock awards outstanding at end of period (in dollars per share)         $ 11.98 $ 12.29  
Common stock dividend payable         $ 25,979,000 $ 34,054,000  
Long Term Equity Based Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares)       247,512     242,505
Grant date fair value per share (in dollars per share)       $ 8.83 $ 5.66   $ 12.45
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Grants (in shares)       247,512     242,505
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Grants (in dollars per share)       $ 8.83 $ 5.66   $ 12.45
Long term incentive compensation expense         $ 818,000 582,000  
Common stock dividend payable         $ 289,000 $ 213,000  
Long Term Equity Based Awards [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares)   269,354          
Grant date fair value per share (in dollars per share)   $ 8.03          
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Grants (in shares)   269,354          
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Grants (in dollars per share)   $ 8.03          
Long Term Equity Based Awards [Member] | December 2015 [Member]              
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Forfeitures (in shares)         (37,199)    
Long Term Equity Based Awards [Member] | December 2013 [Member]              
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Forfeitures (in shares)         (36,467)    
Service-Based Stock Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares)           37,237 35,703
Grant date fair value per share (in dollars per share)           $ 12.47 $ 12.34
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Grants (in shares)           37,237 35,703
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Grants (in dollars per share)           $ 12.47 $ 12.34
Service-Based Stock Awards [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares)   67,337 61,272        
Grant date fair value per share (in dollars per share)   $ 9.32 $ 7.87        
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Grants (in shares)   67,337 61,272        
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Grants (in dollars per share)   $ 9.32 $ 7.87        
Service-Based Stock Awards [Member] | Director Stock Award [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares) 35,000            
Grant date fair value per share (in dollars per share) $ 13.16            
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Grants (in shares) 35,000            
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Grants (in dollars per share) $ 13.16            
Stock Awards Activity [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares)         125,221 114,423 121,026
Grant date fair value per share (in dollars per share)         $ 12.58 $ 13.31 $ 12.01
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Grants (in shares)         125,221 114,423 121,026
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Grants (in dollars per share)         $ 12.58 $ 13.31 $ 12.01
Long term incentive compensation expense         $ 878,000 $ 1,500,000 $ 1,800,000
Other general and administrative expense         436,000 315,000 $ 387,000
Total of unrecognized compensation expense for unvested stock award         $ 953,000    
Compensation cost not yet recognized, period for recognition         1 year 3 months 18 days    
Common stock dividend payable         $ 823,000 $ 1,400,000  
Stock Awards Activity [Member] | January 2016 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares)         118,784    
Grant date fair value per share (in dollars per share)         $ 12.17    
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Grants (in shares)         118,784    
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Grants (in dollars per share)         $ 12.17    
Stock Awards Activity [Member] | February 2017 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total original grants (in shares)         62,137    
Grant date fair value per share (in dollars per share)         $ 11.67    
Equity instruments other than options, nonvested, number of shares [Roll Forward]              
Grants (in shares)         62,137    
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]              
Grants (in dollars per share)         $ 11.67