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Investments (Tables) | 6 Months Ended
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Jun. 30, 2015
Schedule of Amortized Cost and Estimated Fair Value of Investments | The amortized cost and estimated fair value of investments were as follows as of June 30, 2015 and December 31, 2014:
(Dollars in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  |  | Other than temporary impairments recognized in AOCI (1) |
As of June 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury and agency obligations |  | $ | 88,489 |  |  | $ | 1,811 |  |  | $ | (44 | ) |  | $ | 90,256 |  |  | $ | — |
Obligations of states and political subdivisions |  |  | 230,355 |  |  |  | 3,027 |  |  |  | (850 | ) |  |  | 232,532 |  |  |  | — |
Mortgage-backed securities |  |  | 201,267 |  |  |  | 3,193 |  |  |  | (480 | ) |  |  | 203,980 |  |  |  | — |
Asset-backed securities |  |  | 257,401 |  |  |  | 963 |  |  |  | (193 | ) |  |  | 258,171 |  |  |  | (11 | )
Commercial mortgage-backed securities |  |  | 171,467 |  |  |  | 115 |  |  |  | (614 | ) |  |  | 170,968 |  |  |  | — |
Corporate bonds |  |  | 453,473 |  |  |  | 2,838 |  |  |  | (463 | ) |  |  | 455,848 |  |  |  | — |
Foreign corporate bonds |  |  | 138,832 |  |  |  | 660 |  |  |  | (625 | ) |  |  | 138,867 |  |  |  | — |
Total fixed maturities |  |  | 1,541,284 |  |  |  | 12,607 |  |  |  | (3,269 | ) |  |  | 1,550,622 |  |  |  | (11 | )
Common stock |  |  | 103,019 |  |  |  | 20,496 |  |  |  | (2,277 | ) |  |  | 121,238 |  |  |  | — |
Other invested assets |  |  | 28,887 |  |  |  | 2,289 |  |  |  | — |  |  |  | 31,176 |  |  |  | — |
Total |  | $ | 1,673,190 |  |  | $ | 35,392 |  |  | $ | (5,546 | ) |  | $ | 1,703,036 |  |  | $ | (11 | )
(1) | Represents the total amount of other than temporary impairment losses relating to factors other than credit losses recognized in accumulated other comprehensive income (“AOCI”).
(Dollars in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  |  | Other than temporary impairments recognized in AOCI (2) |
As of December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury and agency obligations |  | $ | 78,569 |  |  | $ | 2,281 |  |  | $ | (83 | ) |  | $ | 80,767 |  |  | $ | — |
Obligations of states and political subdivisions |  |  | 188,452 |  |  |  | 3,718 |  |  |  | (697 | ) |  |  | 191,473 |  |  |  | — |
Mortgage-backed securities |  |  | 205,814 |  |  |  | 3,709 |  |  |  | (764 | ) |  |  | 208,759 |  |  |  | (4 | )
Asset-backed securities |  |  | 177,853 |  |  |  | 713 |  |  |  | (303 | ) |  |  | 178,263 |  |  |  | (13 | )
Commercial mortgage-backed securities |  |  | 133,984 |  |  |  | 21 |  |  |  | (847 | ) |  |  | 133,158 |  |  |  | — |
Corporate bonds |  |  | 380,704 |  |  |  | 3,421 |  |  |  | (709 | ) |  |  | 383,416 |  |  |  | — |
Foreign corporate bonds |  |  | 107,572 |  |  |  | 625 |  |  |  | (558 | ) |  |  | 107,639 |  |  |  | — |
Total fixed maturities |  |  | 1,272,948 |  |  |  | 14,488 |  |  |  | (3,961 | ) |  |  | 1,283,475 |  |  |  | (17 | )
Common stock |  |  | 99,297 |  |  |  | 25,689 |  |  |  | (2,938 | ) |  |  | 122,048 |  |  |  | — |
Other invested assets |  |  | 33,174 |  |  |  | 489 |  |  |  | — |  |  |  | 33,663 |  |  |  | — |
Total |  | $ | 1,405,419 |  |  | $ | 40,666 |  |  | $ | (6,899 | ) |  | $ | 1,439,186 |  |  | $ | (17 | )
(2) | Represents the total amount of other than temporary impairment losses relating to factors other than credit losses recognized in accumulated other comprehensive income (“AOCI”).
Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities | maturity, are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
(Dollars in thousands) |  | Amortized Cost |  |  | Estimated Fair Value |
Due in one year or less |  | $ | 112,314 |  |  | $ | 113,541 |
Due in one year through five years |  |  | 704,693 |  |  |  | 708,465 |
Due in five years through ten years |  |  | 67,546 |  |  |  | 68,320 |
Due in ten years through fifteen years |  |  | 8,818 |  |  |  | 9,246 |
Due after fifteen years |  |  | 17,778 |  |  |  | 17,931 |
Mortgage-backed securities |  |  | 201,267 |  |  |  | 203,980 |
Asset-backed securities |  |  | 257,401 |  |  |  | 258,171 |
Commercial mortgage-backed securities |  |  | 171,467 |  |  |  | 170,968 |
Total |  | $ | 1,541,284 |  |  | $ | 1,550,622 |
Summary of Securities With Gross Unrealized Losses | The following table contains an analysis of the Company’s securities with gross unrealized losses, categorized by the period that the securities were in a continuous loss position as of June 30, 2015:
|  | Less than 12 months |  |  | 12 months or longer (1) |  |  | Total |
(Dollars in thousands) |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury and agency obligations |  | $ | 504 |  |  | $ | — |  |  | $ | 3,376 |  |  | $ | (44 | ) |  | $ | 3,880 |  |  | $ | (44 | )
Obligations of states and political subdivisions |  |  | 41,091 |  |  |  | (716 | ) |  |  | 10,266 |  |  |  | (134 | ) |  |  | 51,357 |  |  |  | (850 | )
Mortgage-backed securities |  |  | 62,327 |  |  |  | (357 | ) |  |  | 11,650 |  |  |  | (123 | ) |  |  | 73,977 |  |  |  | (480 | )
Asset-backed securities |  |  | 62,664 |  |  |  | (193 | ) |  |  | — |  |  |  | — |  |  |  | 62,664 |  |  |  | (193 | )
Commercial mortgage-backed securities |  |  | 96,171 |  |  |  | (448 | ) |  |  | 14,862 |  |  |  | (166 | ) |  |  | 111,033 |  |  |  | (614 | )
Corporate bonds |  |  | 130,759 |  |  |  | (446 | ) |  |  | 2,978 |  |  |  | (17 | ) |  |  | 133,737 |  |  |  | (463 | )
Foreign corporate bonds |  |  | 62,754 |  |  |  | (625 | ) |  |  | — |  |  |  | — |  |  |  | 62,754 |  |  |  | (625 | )
Total fixed maturities |  |  | 456,270 |  |  |  | (2,785 | ) |  |  | 43,132 |  |  |  | (484 | ) |  |  | 499,402 |  |  |  | (3,269 | )
Common stock |  |  | 32,507 |  |  |  | (2,277 | ) |  |  | — |  |  |  | — |  |  |  | 32,507 |  |  |  | (2,277 | )
Total |  | $ | 488,777 |  |  | $ | (5,062 | ) |  | $ | 43,132 |  |  | $ | (484 | ) |  | $ | 531,909 |  |  | $ | (5,546 | )
(1) | Fixed maturities in a gross unrealized loss position for twelve months or longer are primarily comprised of non-credit losses on investment grade securities where management does not intend to sell, and it is more likely than not that the Company will not be forced to sell the security before recovery. The Company has analyzed these securities and has determined that they are not other than temporarily impaired.
The following table contains an analysis of the Company’s securities with gross unrealized losses, categorized by the period that the securities were in a continuous loss position as of December 31, 2014:
|  | Less than 12 months |  |  | 12 months or longer (2) |  |  | Total |
(Dollars in thousands) |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury and agency obligations |  | $ | 11,728 |  |  | $ | (9 | ) |  | $ | 3,343 |  |  | $ | (74 | ) |  | $ | 15,071 |  |  | $ | (83 | )
Obligations of states and political subdivisions |  |  | 28,684 |  |  |  | (314 | ) |  |  | 28,061 |  |  |  | (383 | ) |  |  | 56,745 |  |  |  | (697 | )
Mortgage-backed securities |  |  | 2,818 |  |  |  | (7 | ) |  |  | 51,203 |  |  |  | (757 | ) |  |  | 54,021 |  |  |  | (764 | )
Asset-backed securities |  |  | 92,123 |  |  |  | (283 | ) |  |  | 1,683 |  |  |  | (20 | ) |  |  | 93,806 |  |  |  | (303 | )
Commercial mortgage-backed securities |  |  | 92,664 |  |  |  | (525 | ) |  |  | 26,280 |  |  |  | (322 | ) |  |  | 118,944 |  |  |  | (847 | )
Corporate bonds |  |  | 144,505 |  |  |  | (656 | ) |  |  | 3,216 |  |  |  | (53 | ) |  |  | 147,721 |  |  |  | (709 | )
Foreign corporate bonds |  |  | 60,518 |  |  |  | (558 | ) |  |  | — |  |  |  | — |  |  |  | 60,518 |  |  |  | (558 | )
Total fixed maturities |  |  | 433,040 |  |  |  | (2,352 | ) |  |  | 113,786 |  |  |  | (1,609 | ) |  |  | 546,826 |  |  |  | (3,961 | )
Common stock |  |  | 20,002 |  |  |  | (2,808 | ) |  |  | 1,577 |  |  |  | (130 | ) |  |  | 21,579 |  |  |  | (2,938 | )
Total |  | $ | 453,042 |  |  | $ | (5,160 | ) |  | $ | 115,363 |  |  | $ | (1,739 | ) |  | $ | 568,405 |  |  | $ | (6,899 | )
(2) | Fixed maturities in a gross unrealized loss position for twelve months or longer are primarily comprised of non-credit losses on investment grade securities where management does not intend to sell, and it is more likely than not that the Company will not be forced to sell the security before recovery. The Company has analyzed these securities and has determined that they are not other than temporarily impaired.
Schedule of Other Than Temporary Impairments on Investments | The Company recorded the following other than temporary impairments (“OTTI”) on its investment portfolio for the quarters and six months ended June 30, 2015 and 2014:
|  | Quarters Ended June 30, |  |  | Six Months Ended June 30, |
(Dollars in thousands) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OTTI losses, gross |  | $ | (13 | ) |  | $ | — |  |  | $ | (23 | ) |  | $ | (25 | )
Portion of loss recognized in other comprehensive income (pre-tax) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net impairment losses on fixed maturities recognized in earnings |  |  | (13 | ) |  |  | — |  |  |  | (23 | ) |  |  | (25 | )
Equity securities |  |  | (1,885 | ) |  |  | (37 | ) |  |  | (2,215 | ) |  |  | (37 | )
Total |  | $ | (1,898 | ) |  | $ | (37 | ) |  | $ | (2,238 | ) |  | $ | (62 | )
Schedule of Credit Losses Recognized in Earnings | The following table is an analysis of the credit losses recognized in earnings on fixed maturities held by the Company for the quarters and six months ended June 30, 2015 and 2014 for which a portion of the OTTI loss was recognized in other comprehensive income.
|  | Quarters Ended June 30, |  |  | Six Months Ended June 30, |
(Dollars in thousands) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Balance at beginning of period |  | $ | 50 |  |  | $ | 54 |  |  | $ | 50 |  |  | $ | 54 |
Additions where no OTTI was previously recorded |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Additions where an OTTI was previously recorded |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reductions for securities for which the company intends to sell or more likely than not will be required to sell before recovery |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reductions reflecting increases in expected cash flows to be collected |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reductions for securities sold during the period |  |  | (19 | ) |  |  | (4 | ) |  |  | (19 | ) |  |  | (4 | )
Balance at end of period |  | $ | 31 |  |  | $ | 50 |  |  | $ | 31 |  |  | $ | 50 |
Schedule of Accumulated Other Comprehensive Income, Net of Tax | Accumulated other comprehensive income, net of tax, as of June 30, 2015 and December 31, 2014 was as follows:
(Dollars in thousands) |  | June 30, 2015 |  |  | December 31, 2014 |
Net unrealized gains from: |  |  |  |  |  |  |  |
Fixed maturities |  | $ | 9,338 |  |  | $ | 10,527 |
Common stock |  |  | 18,219 |  |  |  | 22,751 |
Other |  |  | 935 |  |  |  | 369 |
Deferred taxes |  |  | (8,390 | ) |  |  | (10,263 | )
Accumulated other comprehensive income, net of tax |  | $ | 20,102 |  |  | $ | 23,384 |
Changes in Accumulated Other Comprehensive Income | The following tables present the changes in accumulated other comprehensive income, net of tax, by component for the quarters and six months ended June 30, 2015 and 2014:
Quarter Ended June 30, 2015 (Dollars in thousands) |  | Unrealized Gains and Losses on Available for Sale Securities, Net of Tax |  |  | Foreign Currency Items, Net of Tax |  |  | Accumulated Other Comprehensive Income, Net of Tax |
Beginning balance |  | $ | 28,206 |  |  | $ | (501) |  |  | $ | 27,705 |
Other comprehensive income (loss) before reclassification |  |  | (6,845 | ) |  |  | 159 |  |  |  | (6,686 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (1,160 | ) |  |  | 243 |  |  |  | (917 | )
Other comprehensive income (loss) |  |  | (8,005 | ) |  |  | 402 |  |  |  | (7,603 | )
Ending balance |  | $ | 20,201 |  |  | $ | (99 | ) |  | $ | 20,102 |
Quarter Ended June 30, 2014 (Dollars in thousands) |  | Unrealized Gains and Losses on Available for Sale Securities, Net of Tax |  |  | Foreign Currency Items, Net of Tax |  |  | Accumulated Other Comprehensive Income, Net of Tax |
Beginning balance |  | $ | 51,958 |  |  | $ | 94 |  |  | $ | 52,052 |
Other comprehensive income (loss) before reclassification |  |  | 11,664 |  |  |  | 41 |  |  |  | 11,705 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (29,694 | ) |  |  | (62 | ) |  |  | (29,756 | )
Other comprehensive income (loss) |  |  | (18,030 | ) |  |  | (21 | ) |  |  | (18,051 | )
Ending balance |  | $ | 33,928 |  |  | $ | 73 |  |  | $ | 34,001 |
Six Months Ended June 30, 2015 (Dollars in thousands) |  | Unrealized Gains and Losses on Available for Sale Securities, Net of Tax |  |  | Foreign Currency Items, Net of Tax |  |  | Accumulated Other Comprehensive Income, Net of Tax |
Beginning balance |  | $ | 23,647 |  |  | $ | (263 | ) |  | $ | 23,384 |
Other comprehensive income (loss) before reclassification |  |  | (404 | ) |  |  | (162 | ) |  |  | (566 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (3,042 | ) |  |  | 326 |  |  |  | (2,716 | )
Other comprehensive income (loss) |  |  | (3,446 | ) |  |  | 164 |  |  |  | (3,282 | )
Ending balance |  | $ | 20,201 |  |  | $ | (99 | ) |  | $ | 20,102 |
Six Months Ended June 30, 2014 (Dollars in thousands) |  | Unrealized Gains and Losses on Available for Sale Securities, Net of Tax |  |  | Foreign Currency Items, Net of Tax |  |  | Accumulated Other Comprehensive Income, Net of Tax |
Beginning balance |  | $ | 53,950 |  |  | $ | 78 |  |  | $ | 54,028 |
Other comprehensive income (loss) before reclassification |  |  | 13,691 |  |  |  | 70 |  |  |  | 13,761 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (33,713 | ) |  |  | (75 | ) |  |  | (33,788 | )
Other comprehensive income (loss) |  |  | (20,022 | ) |  |  | (5 | ) |  |  | (20,027 | )
Ending balance |  | $ | 33,928 |  |  | $ | 73 |  |  | $ | 34,001 |
Reclassifications Out of Accumulated Other Comprehensive Income | The reclassifications out of accumulated other comprehensive income for the quarters and six months ended June 30, 2015 and 2014 were as follows:
|  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income |
|  |  |  | Quarters Ended June 30, |
(Dollars in thousands) Details about Accumulated Other Comprehensive Income Components |  | Affected Line Item in the Consolidated Statements of Operations |  | 2015 |  |  | 2014 |
Unrealized gains and losses on available for sale securities |  | Other net realized investment gains |  | $ | (3,745 | ) |  | $ | (45,840 | )
|  | Other than temporary impairment losses on investments |  |  | 1,897 |  |  |  | 37 |
|  | Total before tax |  |  | (1,848 | ) |  |  | (45,803 | )
|  | Income tax expense (benefit) |  |  | 688 |  |  |  | 16,109 |
|  | Net of tax |  | $ | (1,160 | ) |  | $ | (29,694 | )
Foreign Currency Items |  | Other net realized investment (gains) losses |  | $ | 373 |  |  | $ | (96 | )
|  | Income tax expense (benefit) |  |  | (130 | ) |  |  | 34 |
|  | Net of tax |  | $ | 243 |  |  | $ | (62 | )
Total reclassifications |  | Net of tax |  | $ | (917 | ) |  | $ | (29,756 | )
|  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income |
|  |  |  | Six Months Ended June 30, |
(Dollars in thousands) Details about Accumulated Other Comprehensive Income Components |  | Affected Line Item in the Consolidated Statements of Operations |  | 2015 |  |  | 2014 |
Unrealized gains and losses on available for sale securities |  | Other net realized investment gains |  | $ | (7,126 | ) |  | $ | (51,374 | )
|  | Other than temporary impairment losses on investments |  |  | 2,238 |  |  |  | 62 |
|  | Total before tax |  |  | (4,888 | ) |  |  | (51,312 | )
|  | Income tax expense (benefit) |  |  | 1,846 |  |  |  | 17,599 |
|  | Net of tax |  | $ | (3,042 | ) |  | $ | (33,713 | )
Foreign Currency Items |  | Other net realized investment (gains) losses |  | $ | 501 |  |  | $ | (116 | )
|  | Income tax expense (benefit) |  |  | (175 | ) |  |  | 41 |
|  | Net of tax |  | $ | 326 |  |  | $ | (75 | )
Total reclassifications |  | Net of tax |  | $ | (2,716 | ) |  | $ | (33,788 | )
Components of Net Realized Investment Gains | The components of net realized investment gains for the quarters and six months ended June 30, 2015 and 2014 were as follows:
|  | Quarters Ended June 30, |  |  | Six Months Ended June 30, |
(Dollars in thousands) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  | $ | 746 |  |  | $ | 719 |  |  | $ | 1,479 |  |  | $ | 2,389 |
Gross realized losses |  |  | (110 | ) |  |  | (96 | ) |  |  | (241 | ) |  |  | (226 | )
Net realized gains |  |  | 636 |  |  |  | 623 |  |  |  | 1,238 |  |  |  | 2,163 |
Common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  | 3,371 |  |  |  | 45,868 |  |  |  | 5,923 |  |  |  | 49,875 |
Gross realized losses |  |  | (2,532 | ) |  |  | (592 | ) |  |  | (2,870 | ) |  |  | (610 | )
Net realized gains |  |  | 839 |  |  |  | 45,276 |  |  |  | 3,053 |  |  |  | 49,265 |
Preferred stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  | — |  |  |  | — |  |  |  | 96 |  |  |  | — |
Gross realized losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net realized gains |  |  | — |  |  |  | — |  |  |  | 96 |  |  |  | — |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  | 6,353 |  |  |  | — |  |  |  | 1,873 |  |  |  | — |
Gross realized losses |  |  | (1,296 | ) |  |  | (6,018 | ) |  |  | (2,698 | ) |  |  | (12,360 | )
Net realized gains (losses) |  |  | 5,057 |  |  |  | (6,018 | ) |  |  | (825 | ) |  |  | (12,360 | )
Total net realized investment gains |  | $ | 6,532 |  |  | $ | 39,881 |  |  | $ | 3,562 |  |  | $ | 39,068 |
Proceeds from Sales of Available-for-Sale Securities | The proceeds from sales of available-for-sale securities resulting in net realized investment gains for the six months ended June 30, 2015 and 2014 were as follows:
|  | Six Months Ended June 30, |
(Dollars in thousands) |  | 2015 |  |  | 2014 |
Fixed maturities |  | $ | 211,542 |  |  | $ | 219,195 |
Equity securities |  |  | 22,327 |  |  |  | 35,837 |
Preferred stock |  |  | 1,540 |  |  |  | — |
Schedule of Investment Income | The sources of net investment income for the quarters and six months ended June 30, 2015 and 2014 were as follows:
|  | Quarters Ended June 30, |  |  | Six Months Ended June 30, |
(Dollars in thousands) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Fixed maturities |  | $ | 8,022 |  |  | $ | 6,797 |  |  | $ | 16,036 |  |  | $ | 14,052 |
Equity securities |  |  | 924 |  |  |  | 1,941 |  |  |  | 1,716 |  |  |  | 4,081 |
Cash and cash equivalents |  |  | 9 |  |  |  | 10 |  |  |  | 27 |  |  |  | 28 |
Other invested assets |  |  | 1,089 |  |  |  | 87 |  |  |  | 1,342 |  |  |  | 87 |
Total investment income |  |  | 10,044 |  |  |  | 8,835 |  |  |  | 19,121 |  |  |  | 18,248 |
Investment expense |  |  | (903 | ) |  |  | (1,158 | ) |  |  | (1,739 | ) |  |  | (2,287 | )
Net investment income |  | $ | 9,141 |  |  | $ | 7,677 |  |  | $ | 17,382 |  |  | $ | 15,961 |
Schedule of Total Investment Return | The Company’s total investment return on a pre-tax basis for the quarters and six months ended June 30, 2015 and 2014 were as follows:
|  | Quarters Ended June 30, |  |  | Six Months Ended June 30, |
(Dollars in thousands) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Net investment income |  | $ | 9,141 |  |  | $ | 7,677 |  |  | $ | 17,382 |  |  | $ | 15,961 |
Net realized investment gains |  |  | 6,532 |  |  |  | 39,881 |  |  |  | 3,562 |  |  |  | 39,068 |
Change in unrealized investment losses |  |  | (9,752 | ) |  |  | (29,203 | ) |  |  | (5,155 | ) |  |  | (31,774 | )
Net realized and unrealized investment returns |  |  | (3,220 | ) |  |  | 10,678 |  |  |  | (1,593 | ) |  |  | 7,294 |
Total investment return |  | $ | 5,921 |  |  | $ | 18,355 |  |  | $ | 15,789 |  |  | $ | 23,255 |
Total investment return % (1) |  |  | 0.3 | % |  |  | 1.2 | % |  |  | 0.9 | % |  |  | 1.5 | %
Average investment portfolio (2) |  | $ | 1,776,326 |  |  | $ | 1,577,630 |  |  | $ | 1,758,103 |  |  | $ | 1,585,304 |
(1) | Not annualized.
(2) | Average of total cash and invested assets, net of receivable/payable for securities purchased and sold, as of the beginning and end of the period.
Municipal Bonds with and without Insurance | The following table provides a breakdown of the ratings for these municipal bonds with and without insurance.
(Dollars in thousands) |  | Ratings with |  |  | Ratings without |
Rating |  | Insurance |  |  | Insurance |
AA |  | $ | 515 |  |  | $ | — |
BB |  |  | — |  |  |  | 515 |
Total |  | $ | 515 |  |  | $ | 515 |
Summary of Insurance Enhanced Municipal Bonds Backed by Financial Guarantors | A summary of the Company’s insurance enhanced municipal bonds that are backed by financial guarantors, including the pre-refunded bonds that are escrowed in U.S. government obligations, as of June 30, 2015, is as follows:
(Dollars in thousands) Financial Guarantor |  | Total |  |  | Pre-refunded Securities |  |  | Government Guaranteed Securities |  |  | Exposure Net of Pre-refunded & Government Guaranteed Securities |
Ambac Financial Group |  | $ | 1,688 |  |  | $ | 138 |  |  | $ | — |  |  | $ | 1,550 |
Assured Guaranty Corporation |  |  | 3,692 |  |  |  | — |  |  |  | — |  |  |  | 3,692 |
Municipal Bond Insurance Association |  |  | 5,159 |  |  |  | — |  |  |  | — |  |  |  | 5,159 |
Gov’t National Housing Association |  |  | 552 |  |  |  | — |  |  |  | 552 |  |  |  | — |
Total backed by financial guarantors |  |  | 11,091 |  |  |  | 138 |  |  |  | 552 |  |  |  | 10,401 |
Other credit enhanced municipal bonds |  |  | 6,363 |  |  |  | 6,363 |  |  |  | — |  |  |  | — |
Total |  | $ | 17,454 |  |  | $ | 6,501 |  |  | $ | 552 |  |  | $ | 10,401 |
Summary of Estimated Fair Values of Bonds Held on Deposit | The fair values were as follows as of June 30, 2015 and December 31, 2014:
|  | Estimated Fair Value |
(Dollars in thousands) |  | June 30, 2015 |  |  | December 31, 2014 |
On deposit with governmental authorities |  | $ | 39,965 |  |  | $ | 32,790 |
Intercompany trusts held for the benefit of U.S. policyholders |  |  | 548,038 |  |  |  | 495,301 |
Held in trust pursuant to third party requirements |  |  | 93,053 |  |  |  | 95,828 |
Letter of credit held for third party requirements |  |  | 6,112 |  |  |  | 9,340 |
Securities held as collateral for borrowing arrangements (1) |  |  | 238,283 |  |  |  | 222,809 |
Total |  | $ | 925,451 |  |  | $ | 856,068 |
(1) | Amount required to collateralize margin borrowing facilities.

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