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DEBT AND LINES OF CREDIT - Term Loan (Details) - Term Loan credit facility, due April 2021
$ in Millions
12 Months Ended
May 12, 2014
USD ($)
Apr. 10, 2014
USD ($)
Dec. 31, 2016
USD ($)
DEBT AND LINES OF CREDIT      
Aggregate principal amount $ 400.0 $ 400.0  
Quarterly amortization payments   $ 1.0  
Frequency of periodic payment   quarterly  
Net proceeds used to redeem the Company's remaining outstanding debt 354.8    
Net proceeds $ 392.0    
Additional borrowing capacity     $ 100.0
Consolidated net total secured debt ratio used for determining additional amount     3.75
LIBOR      
DEBT AND LINES OF CREDIT      
Floor rate (as a percent)     1.00%
Spread on variable rate basis     3.00%