Annual report pursuant to Section 13 and 15(d)

STOCK BASED AND DEFERRED COMPENSATION - Summary of Stock Option Activity (Details)

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STOCK BASED AND DEFERRED COMPENSATION - Summary of Stock Option Activity (Details) - $ / shares
 12 Months Ended 96 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Options      
Options outstanding at beginning of year (in shares) 14,400 181,440  
Granted (in shares) 0 0 0
Exercised (in shares) (14,400) (147,040)  
Cancelled (in shares) 0 (20,000)  
Outstanding at end of year (in shares) 0 14,400 0
Weighted Average Exercise Price      
Options outstanding at beginning of year (in dollars per share) $ 16.11 $ 18.69  
Exercised (in dollars per share) $ 16.11 19.62  
Cancelled (in dollars per share)   13.69  
Outstanding at end of year (in dollars per share)   $ 16.11  
Exercisable at end of year      
Options (in shares) 0 14,400  
Options (in dollars per share)   $ 16.11  
Price range of options exercised - lower range limit (in dollars per share) $ 11.48 11.48  
Price range of options exercised - upper range limit (in dollars per share) $ 22.11 22.11  
Price range of options outstanding - lower range limit (in dollars per share)   11.48  
Price range of options outstanding - upper range limit (in dollars per share)   $ 22.11