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STOCK INCENTIVE PLANS - Director Stock Awards (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Director stock awards      
Deferred stock units (DSU) granted $ 145,000 $ 125,000 $ 125,000
Directors' deferred stock unit grants      
Beginning balance (in shares) 159,670 158,868 151,775
Dividends (in shares) 2,952 2,602 2,259
Deferred fees (in shares) 6,996 5,866 7,337
Retirement distribution (in shares) (22,170) (7,666) (2,503)
Ending balance (in shares) 147,448 159,670 158,868
Beginning balance $ 33,474,000 $ 33,063,000 $ 30,952,000
Dividends 661,000 653,000 559,000
Deferred fees 1,743,000 1,453,000 2,059,000
Retirement distribution (4,700,000) (1,695,000) (507,000)
Ending balance $ 31,178,000 $ 33,474,000 $ 33,063,000
Share-Based Compensation Arrangement By Share-Based Award Type, Number Of Days To Determine Average Share Price 200 days