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Derivative Instruments | 6 Months Ended
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Jun. 30, 2015
Derivative Instruments | 4. Derivative Instruments Interest rate swaps are used by the Company primarily to reduce risks from changes in interest rates. Under the terms of the interest rate swaps, the Company agrees with another party to exchange, at specified intervals, the difference between fixed rate and floating rate interest amounts as calculated by reference to an agreed notional amount. The Company accounts for the interest rate swaps as non-hedge instruments and recognizes the fair value of the interest rate swaps in other assets or other liabilities on the consolidated balance sheets with the changes in fair value recognized as net realized investment gains in the consolidated statement of operations. The estimated fair value of the interest rate swaps, which is primarily derived from the forward interest rate curve, is based on the valuation received from a third party financial institution. The following table summarizes information on the location and the gross amount of the derivatives’ fair value on the consolidated balance sheets as of June 30, 2015 and December 31, 2014:
(Dollars in thousands) |  |  |  |  | June 30, 2015 |  |  | December 31, 2014 |
Derivatives Not Designated as Hedging Instruments under ASC 815 |  | Balance Sheet Location |  |  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Interest rate swap agreements |  |  | Other liabilities |  |  | $ | 200,000 |  |  | $ | (11,801 | ) |  | $ | 200,000 |  |  | $ | (13,675 | )
The following table summarizes the net gain and losses included in the consolidated statement of operations for changes in the fair value of the derivatives and the periodic net interest settlements under the derivatives for the quarters and six months ended June 30, 2015 and 2014:
|  |  | Quarters Ended June 30, |  |  | Six Months Ended June 30, |
(Dollars in thousands) |  | Statement of Operations Line |  |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Interest rate swap agreements |  |  | Net realized investment gains |  |  | $ | 5,057 |  |  | $ | (6,018 | ) |  | $ | (825 | ) |  | $ | (12,360 | )
As of June 30, 2015, the Company is due receivables of $5.3 million for collateral posted and $13.1 million for margin calls made in connection with the interest rate swaps. These amounts are included in other assets on the consolidated balance sheets.

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- Definition The entire disclosure for derivatives and fair value of assets and liabilities. + References No definition available. + Details
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