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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Foley & Lardner LLP      
Related Party Transactions      
Fees paid     $ 2.4
Foley & Lardner LLP      
Related Party Transactions      
Professional Fees $ 2.9 $ 3.0