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LONG-TERM DEBT - Long term debt table (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Apr. 10, 2015
LONG-TERM DEBT      
Unamortized debt issuance costs $ (9.0) $ (10.0)  
Total long-term debt, net of unamortized debt issuance costs 601.0 580.0  
5.625% Senior Notes      
LONG-TERM DEBT      
5.625% senior notes 350.0 350.0 $ 350.0
Unamortized debt issuance costs $ (5.0) $ (6.0)  
Stated interest rate (as a percent) 5.625% 5.625% 5.625%
Revolving Credit Facility      
LONG-TERM DEBT      
Revolving credit facility $ 260.0 $ 240.0  
Unamortized debt issuance costs $ (4.0) $ (4.0)  
Stated interest rate (as a percent) 2.74% 2.27%