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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Pronouncements (Details) - Subsequent Event - Expected - ASU 2016-02
$ in Millions
Jan. 01, 2019
USD ($)
Maximum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use asset $ 25.0
Lease liability 25.0
Minimum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use asset 23.0
Lease liability $ 23.0