Derivative Instruments and Hedging Activities (Details 2) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES [Abstract]
Derivative Assets, Fair Value, Gross Assets	$ 38,182	$ 44,637
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	38,182	44,637
Derivative Asset, Not Offset, Policy Election Deduction	(19,279)	(25,187)
Cash Collateral Received	(3,838)	(9,918)
Derivative Asset, Fair Value, Amount Offset Against Collateral	15,065	9,532
Derivative Liability, Fair Value, Gross Liability	(25,577)	(36,102)
Gross Amount of Eligible Offsetting Recognized Derivative Assets	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(25,577)	(36,102)
Derivative Liability, Not Offset, Policy Election Deduction	19,279	25,187
Cash Collateral Paid	969	2,048
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ (5,329)	$ (8,867)

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES [Abstract]

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset, deducted from derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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