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DERIVATIVE AND HEDGING ACTIVITIES - Netting Arrangements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative Assets
Gross Amounts Presented in the Consolidated Balance Sheet	$ 19,347	$ 677
Amounts Not Offset in the Consolidated Balance Sheet	(18,040)	(231)
Net Amount	1,307	446
Derivative Liabilities
Gross Amounts Presented in the Consolidated Balance Sheet	(123,635)	(26,999)
Amounts Not Offset in the Consolidated Balance Sheet	18,040	231
Net Amount	$ (105,595)	$ (26,768)

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