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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Accounting Guidance Adopted) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounting Standards Update 2016-18    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Adjustments to net cash provided by (used) in investing activities as a result of adoption of new accounting standards $ (11,434) $ 5,491