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COMPENSATION PROGRAMS, Schedule of Restricted Stock Awards (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2016
Jan. 31, 2016
Jul. 31, 2015
Jan. 31, 2015
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Grant date fair value per share (in dollars per share)     $ 11.41     $ 8.63      
Total original grants (in shares)     35,000     128,609      
Equity instruments other than options, nonvested, number of shares [Roll Forward]                  
Unvested stock awards outstanding at beginning of period (in shares)           288,861      
Grants (in shares)     35,000     128,609      
Vestings (in shares)           (118,784)      
Unvested stock awards outstanding at end of period (in shares)         298,686 298,686      
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      
Grants (in dollars per share)     $ 11.41     8.63      
Vestings (in dollars per share)           12.17      
Unvested stock awards outstanding at end of period (in dollars per share)         $ 10.46 $ 10.46      
Common stock dividend payable         $ 22,738,000 $ 22,738,000     $ 25,979,000
Performance-based RSUs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Grant date fair value per share (in dollars per share) $ 8.03     $ 8.83   $ 3.81   $ 12.45  
Total original grants (in shares) 269,354     247,512       242,505  
Equity instruments other than options, nonvested, number of shares [Roll Forward]                  
Grants (in shares) 269,354     247,512       242,505  
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]                  
Grants (in dollars per share) $ 8.03     $ 8.83   $ 3.81   $ 12.45  
Long term incentive compensation expense         116,000 $ 549,000      
Common stock dividend payable         386,000 $ 386,000      
Performance-based RSUs [Member] | December 2013 [Member]                  
Equity instruments other than options, nonvested, number of shares [Roll Forward]                  
Forfeitures (in shares)           (36,467)      
Performance-based RSUs [Member] | December 2015 [Member]                  
Equity instruments other than options, nonvested, number of shares [Roll Forward]                  
Forfeitures (in shares)           (37,199)      
Service-Based Stock Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Grant date fair value per share (in dollars per share) $ 9.32 $ 7.87         $ 12.47 $ 12.34  
Total original grants (in shares) 67,337 61,272         37,237 35,703  
Equity instruments other than options, nonvested, number of shares [Roll Forward]                  
Grants (in shares) 67,337 61,272         37,237 35,703  
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]                  
Grants (in dollars per share) $ 9.32 $ 7.87         $ 12.47 $ 12.34  
Stock Awards Activity [Member]                  
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]                  
Long term incentive compensation expense         229,000 $ 441,000      
Other general and administrative expense         100,000 200,000      
Total of unrecognized compensation expense for unvested stock award         1,400,000 $ 1,400,000      
Compensation cost not yet recognized, period for recognition           1 year 6 months      
Common stock dividend payable         $ 314,000 $ 314,000      
Stock Awards Activity [Member] | February 2017 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Grant date fair value per share (in dollars per share)           $ 11.67      
Total original grants (in shares)           62,137      
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      
Stock Awards Activity [Member] | January 2016 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Grant date fair value per share (in dollars per share)           $ 12.17      
Total original grants (in shares)           118,784      
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