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DERIVATIVE AND HEDGING ACTIVITIES - Netting Arrangements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative Assets
Gross Amounts Presented in the Consolidated Balance Sheet	$ 16,067	$ 69,717
Amounts Not Offset in the Consolidated Balance Sheet	(12,807)	(10,263)
Net Amount	3,260	59,454
Derivative Liabilities
Gross Amounts Presented in the Consolidated Balance Sheet	(27,427)	(12,907)
Amounts Not Offset in the Consolidated Balance Sheet	12,807	10,263
Net Amount	$ (14,620)	$ (2,644)

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