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EMPLOYEE RETIREMENT PLANS (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Benefits earned during the period $ 1,472 $ 1,212 $ 1,187
Interest cost on projected benefit obligation 2,317 2,373 2,449
Expected return on plan assets (1,994) (2,021) (1,836)
Net amortization and deferral 1,612 1,272 1,448
Net pension expense $ 3,407 $ 2,836 $ 3,248