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Investments | 6 Months Ended
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Jun. 30, 2019
Investments [Abstract] |
Investments | Investments Fixed income securities The amortized cost, gross unrealized gains and losses, and fair value of investments in fixed income securities classified as available-for-sale at June 30, 2019 and December 31, 2018 are shown in tables 7.1a and 7.1b below.
Details of fixed income securities by category as of June 30, 2019
Table | 7.1a |  |  |  |  |  |  |  |
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) (1) |  | Fair Value
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 194,222 |  |  | $ | 1,474 |  |  | $ | (127 | ) |  | $ | 195,569 |
Obligations of U.S. states and political subdivisions |  | 1,566,166 |  |  | 88,379 |  |  | (648 | ) |  | 1,653,897 |
Corporate debt securities |  | 2,570,289 |  |  | 61,459 |  |  | (3,134 | ) |  | 2,628,614 |
Asset backed securities (“ABS”) |  | 215,016 |  |  | 2,787 |  |  | (102 | ) |  | 217,701 |
Residential mortgage backed securities (“RMBS”) |  | 213,024 |  |  | 183 |  |  | (4,710 | ) |  | 208,497 |
Commercial mortgage backed securities (“CMBS”) |  | 268,189 |  |  | 4,450 |  |  | (750 | ) |  | 271,889 |
Collateralized loan obligations (“CLO”) |  | 330,530 |  |  | 55 |  |  | (1,929 | ) |  | 328,656 |
Total fixed income securities |  | $ | 5,357,436 |  |  | $ | 158,787 |  |  | $ | (11,400 | ) |  | $ | 5,504,823 |
Details of fixed income securities by category as of December 31, 2018
Table | 7.1b |  |  |  |  |  |  |  |
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) (1) |  | Fair Value
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 167,655 |  |  | $ | 597 |  |  | $ | (1,076 | ) |  | $ | 167,176 |
Obligations of U.S. states and political subdivisions |  | 1,701,826 |  |  | 29,259 |  |  | (10,985 | ) |  | 1,720,100 |
Corporate debt securities |  | 2,439,173 |  |  | 2,103 |  |  | (40,514 | ) |  | 2,400,762 |
ABS |  | 111,953 |  |  | 226 |  |  | (146 | ) |  | 112,033 |
RMBS |  | 189,238 |  |  | 32 |  |  | (10,309 | ) |  | 178,961 |
CMBS |  | 276,352 |  |  | 888 |  |  | (9,580 | ) |  | 267,660 |
CLOs |  | 310,587 |  |  | 2 |  |  | (5,294 | ) |  | 305,295 |
Total fixed income securities |  | $ | 5,196,784 |  |  | $ | 33,107 |  |  | $ | (77,904 | ) |  | $ | 5,151,987 |
(1) | At June 30, 2019 and December 31, 2018, there were no other-than-temporary impairment losses recorded in other comprehensive income.
We had $13.7 million and $13.5 million of investments at fair value on deposit with various states as of June 30, 2019 and December 31, 2018, respectively, due to regulatory requirements of those state insurance departments. The amortized cost and fair values of fixed income securities at June 30, 2019, by contractual maturity, are shown in table 7.2 below. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Because most ABS, RMBS, CMBS, and CLOs provide for periodic payments throughout their lives, they are listed in separate categories.
Fixed income securities maturity schedule
Table | 7.2 |  |  |  |
|  | June 30, 2019
(In thousands) |  | Amortized cost |  | Fair Value
Due in one year or less |  | $ | 367,161 |  |  | $ | 367,474 |
Due after one year through five years |  | 1,900,096 |  |  | 1,930,664 |
Due after five years through ten years |  | 930,951 |  |  | 976,031 |
Due after ten years |  | 1,132,469 |  |  | 1,203,911 |
|  | 4,330,677 |  |  | 4,478,080 |
ABS |  | 215,016 |  |  | 217,701 |
RMBS |  | 213,024 |  |  | 208,497 |
CMBS |  | 268,189 |  |  | 271,889 |
CLOs |  | 330,530 |  |  | 328,656 |
Total as of June 30, 2019 |  | $ | 5,357,436 |  |  | $ | 5,504,823 |
Proceeds from sales of fixed income securities classified as available-for-sale were $183.6 million and $25.1 million during the six months ended June 30, 2019 and 2018, respectively. Gross gains of $1.2 million and $2.0 million and gross losses of $1.1 million and $2.3 million were realized on those sales during the three and six months ended June 30, 2019, respectively. Gross gains of $0.1 million and $0.2 million and gross losses of $0.6 million and $1.0 million were realized on those sales during the three and six months ended June 30, 2018, respectively. During the six months ended June 30, 2019, we recorded other-than-temporary impairment (“OTTI”) losses of $0.1 million. During the three and six months ended June 30, 2018, we recorded OTTI losses of $1.3 million. Equity securities The cost and fair value of investments in equity securities at June 30, 2019 and December 31, 2018 are shown in tables 7.3a and 7.3b below.
Details of equity security investments as of June 30, 2019
Table | 7.3a |  |  |  |  |  |  |  |
(In thousands) |  | Cost |  | Gross Gains |  | Gross Losses |  | Fair Value
Equity securities |  | $ | 3,991 |  |  | $ | 129 |  |  | $ | (6 | ) |  | $ | 4,114 |
Details of equity security investments as of December 31, 2018
Table | 7.3b |  |  |  |  |  |  |  |
(In thousands) |  | Cost |  | Gross Gains |  | Gross Losses |  | Fair Value
Equity securities |  | $ | 3,993 |  |  | $ | 11 |  |  | $ | (72 | ) |  | $ | 3,932 |
For the three and six months ended June 30, 2019, we recognized $0.1 million and $0.2 million of net gains on equity securities still held as of June 30, 2019. For the six months ended June 30, 2018, we recognized $0.1 million of net losses on equity securities still held as of June 30, 2018. Other invested assets Other invested assets include an investment in Federal Home Loan Bank (“FHLB”) stock that is carried at cost, which due to its nature approximates fair value. Ownership of FHLB stock provides access to a secured lending facility, and our current FHLB Advance amount is secured by eligible collateral whose fair value is maintained at a minimum of 102% of the outstanding principal balance. As of June 30, 2019, that collateral consisted of fixed income securities included in our total investment portfolio, and cash and cash equivalents, with a total fair value of $163.0 million. Unrealized investment losses Tables 7.4a and 7.4b below summarize, for all available-for-sale investments in an unrealized loss position at June 30, 2019 and December 31, 2018, the aggregate fair value and gross unrealized loss by the length of time those securities have been continuously in an unrealized loss position. The fair value amounts reported in tables 7.4a and 7.4b are estimated using the process described in Note 8 - “Fair Value Measurements” to these consolidated financial statements and in Note 3 - “Significant Accounting Policies” of the notes to the consolidated financial statements in our 2018 Annual Report on Form 10-K.
Unrealized loss aging for securities by type and length of time as of June 30, 2019
Table | 7.4a |  |  |  |  |  |  |  |  |  |  |  |
|  | Less Than 12 Months |  | 12 Months or Greater |  | Total
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 12,483 |  |  | $ | (19 | ) |  | $ | 45,423 |  |  | $ | (108 | ) |  | $ | 57,906 |  |  | $ | (127 | )
Obligations of U.S. states and political subdivisions |  | 2,283 |  |  | (468 | ) |  | 57,193 |  |  | (180 | ) |  | 59,476 |  |  | (648 | )
Corporate debt securities |  | 29,333 |  |  | (1,987 | ) |  | 298,419 |  |  | (1,147 | ) |  | 327,752 |  |  | (3,134 | )
ABS |  | 9,257 |  |  | (102 | ) |  | — |  |  | — |  |  | 9,257 |  |  | (102 | )
RMBS |  | 32,181 |  |  | (297 | ) |  | 158,325 |  |  | (4,413 | ) |  | 190,506 |  |  | (4,710 | )
CMBS |  | — |  |  | — |  |  | 78,697 |  |  | (750 | ) |  | 78,697 |  |  | (750 | )
CLOs |  | 247,983 |  |  | (1,587 | ) |  | 45,137 |  |  | (342 | ) |  | 293,120 |  |  | (1,929 | )
Total |  | $ | 333,520 |  |  | $ | (4,460 | ) |  | $ | 683,194 |  |  | $ | (6,940 | ) |  | $ | 1,016,714 |  |  | $ | (11,400 | )
Unrealized loss aging for securities by type and length of time as of December 31, 2018
Table | 7.4b |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Less Than 12 Months |  | 12 Months or Greater |  | Total
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 23,710 |  |  | $ | (15 | ) |  | $ | 69,146 |  |  | $ | (1,061 | ) |  | $ | 92,856 |  |  | $ | (1,076 | )
Obligations of U.S. states and political subdivisions |  | 316,655 |  |  | (3,875 | ) |  | 358,086 |  |  | (7,110 | ) |  | 674,741 |  |  | (10,985 | )
Corporate debt securities |  | 1,272,279 |  |  | (18,130 | ) |  | 785,627 |  |  | (22,384 | ) |  | 2,057,906 |  |  | (40,514 | )
ABS |  | 51,324 |  |  | (146 | ) |  | — |  |  | — |  |  | 51,324 |  |  | (146 | )
RMBS |  | 24 |  |  | — |  |  | 178,573 |  |  | (10,309 | ) |  | 178,597 |  |  | (10,309 | )
CMBS |  | 65,704 |  |  | (1,060 | ) |  | 163,272 |  |  | (8,520 | ) |  | 228,976 |  |  | (9,580 | )
CLOs |  | 296,497 |  |  | (5,294 | ) |  | — |  |  | — |  |  | 296,497 |  |  | (5,294 | )
Total |  | $ | 2,026,193 |  |  | $ | (28,520 | ) |  | $ | 1,554,704 |  |  | $ | (49,384 | ) |  | $ | 3,580,897 |  |  | $ | (77,904 | )
The unrealized losses in all categories of our investments at June 30, 2019 and December 31, 2018 were primarily caused by changes in interest rates between the time of purchase and the respective fair value measurement date. There were 243 and 721 securities in an unrealized loss position at June 30, 2019 and December 31, 2018, respectively.

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