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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ (24,399)   $ (24,499)  
Other comprehensive income before reclassifications 73   136  
Amounts reclassified from AOCL 31   68  
Other Comprehensive Income - Net of Tax [1] 104 $ 106 204 $ 107
Ending balance $ (24,295)   $ (24,295)  
Combined statutory tax rate 40.00% 40.00% 40.00% 40.00%
Postretirement Liability Adjustment        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ (22,145)   $ (22,145)  
Other comprehensive income before reclassifications 0   0  
Amounts reclassified from AOCL 0   0  
Other Comprehensive Income - Net of Tax 0   0  
Ending balance (22,145)   (22,145)  
Unrealized Gain (Loss) on Derivatives-Other        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (2,078)   (2,129)  
Other comprehensive income before reclassifications 0   0  
Amounts reclassified from AOCL 49   100  
Other Comprehensive Income - Net of Tax 49   100  
Ending balance (2,029)   (2,029)  
Unrealized Gain (Loss) on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (79)   (128)  
Other comprehensive income before reclassifications 73   136  
Amounts reclassified from AOCL (18)   (32)  
Other Comprehensive Income - Net of Tax 55   104  
Ending balance (24)   (24)  
Other Comprehensive Income (Loss) of Affiliated Companies        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (97)   (97)  
Other comprehensive income before reclassifications 0   0  
Amounts reclassified from AOCL 0   0  
Other Comprehensive Income - Net of Tax 0   0  
Ending balance $ (97)   $ (97)  
[1] Determined using a combined average statutory tax rate of 40%.