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Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2015
Summarized Information of Location and Gross Amount of Derivatives' Fair Value in Consolidated Balance Sheets | 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 | )
Summary of Net Losses Included in Consolidated Statement of Operations for Changes in Fair Value of Derivatives and Periodic net Interest Settlements Under Derivatives | 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 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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