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EMPLOYEE BENEFIT PLANS (Deferred Comp Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Deferred salary agreements    
Deferred Compensation Plans    
Recorded liabilities $ 3.4 $ 3.9
Voluntary Savings Plan - mutual funds held in trust    
Deferred Compensation Plans    
Minimum period for election to defer receipt of a portion of salary and incentive compensation 6 months  
Voluntary Savings Plan - mutual funds held in trust | Other long-term assets    
Deferred Compensation Plans    
VSP assets $ 2.2 2.1
Voluntary Savings Plan - mutual funds held in trust | Other long-term liabilities    
Deferred Compensation Plans    
VSP liabilities $ 2.2 $ 2.1