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OTHER CURRENT ASSETS AND OTHER ASSETS - Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
OTHER CURRENT ASSETS AND OTHER ASSETS                
Cash Surrender Value of COLI $ 11,851       $ 9,116      
Non-trade receivables 2,339       2,001      
Deposits 5,251       4,128      
Other miscellaneous 11       259      
Total $ 19,452 $ 20,055 $ 18,384 $ 17,826 $ 15,504 $ 16,305 $ 15,872 $ 16,064