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Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Amortized cost and estimated fair value of available-for-sale fixed maturities and equity securities | Available-for-sale fixed maturities at June 30, 2018 and December 31, 2017 included the following:
| June 30, 2018
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Fixed maturities, available for sale |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 148,588 |  |  | $ | 249 |  |  | $ | 2,380 |  |  | $ | 146,457 |
U.S. Government-sponsored enterprise obligations | 32,331 |  |  | 21 |  |  | 650 |  |  | 31,702 |
State and municipal bonds | 326,705 |  |  | 5,488 |  |  | 1,093 |  |  | 331,100 |
Corporate debt | 1,213,362 |  |  | 4,655 |  |  | 22,390 |  |  | 1,195,627 |
Residential mortgage-backed securities | 208,052 |  |  | 1,150 |  |  | 4,966 |  |  | 204,236 |
Agency commercial mortgage-backed securities | 14,080 |  |  | — |  |  | 268 |  |  | 13,812 |
Other commercial mortgage-backed securities | 33,105 |  |  | 47 |  |  | 437 |  |  | 32,715 |
Other asset-backed securities | 171,917 |  |  | 20 |  |  | 1,665 |  |  | 170,272 |
| $ | 2,148,140 |  |  | $ | 11,630 |  |  | $ | 33,849 |  |  | $ | 2,125,921 |
| December 31, 2017
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Fixed maturities, available for sale |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 134,323 |  |  | $ | 485 |  |  | $ | 1,181 |  |  | $ | 133,627 |
U.S. Government-sponsored enterprise obligations | 21,089 |  |  | 73 |  |  | 206 |  |  | 20,956 |
State and municipal bonds | 618,414 |  |  | 14,248 |  |  | 419 |  |  | 632,243 |
Corporate debt | 1,157,660 |  |  | 15,205 |  |  | 5,707 |  |  | 1,167,158 |
Residential mortgage-backed securities | 196,741 |  |  | 2,438 |  |  | 1,335 |  |  | 197,844 |
Agency commercial mortgage-backed securities | 10,827 |  |  | 23 |  |  | 108 |  |  | 10,742 |
Other commercial mortgage-backed securities | 16,004 |  |  | 91 |  |  | 134 |  |  | 15,961 |
Other asset-backed securities | 102,130 |  |  | 47 |  |  | 466 |  |  | 101,711 |
| $ | 2,257,188 |  |  | $ | 32,610 |  |  | $ | 9,556 |  |  | $ | 2,280,242 |
Schedule of available for sale securities by contractual maturity | The recorded cost basis and estimated fair value of available-for-sale fixed maturities at June 30, 2018, by contractual 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.
(In thousands) | Amortized Cost |  | Due in one year or less |  | Due after one year through five years |  | Due after five years through ten years |  | Due after ten years |  | Total Fair Value
Fixed maturities, available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 148,588 |  |  | $ | 37,731 |  |  | $ | 84,483 |  |  | $ | 21,407 |  |  | $ | 2,836 |  |  | $ | 146,457 |
U.S. Government-sponsored enterprise obligations | 32,331 |  |  | 206 |  |  | 11,647 |  |  | 19,715 |  |  | 134 |  |  | 31,702 |
State and municipal bonds | 326,705 |  |  | 25,562 |  |  | 126,115 |  |  | 140,281 |  |  | 39,142 |  |  | 331,100 |
Corporate debt | 1,213,362 |  |  | 116,559 |  |  | 666,434 |  |  | 374,029 |  |  | 38,605 |  |  | 1,195,627 |
Residential mortgage-backed securities | 208,052 |  |  |  |  |  |  |  |  |  |  | 204,236 |
Agency commercial mortgage-backed securities | 14,080 |  |  |  |  |  |  |  |  |  |  | 13,812 |
Other commercial mortgage-backed securities | 33,105 |  |  |  |  |  |  |  |  |  |  | 32,715 |
Other asset-backed securities | 171,917 |  |  |  |  |  |  |  |  |  |  | 170,272 |
| $ | 2,148,140 |  |  |  |  |  |  |  |  |  |  | $ | 2,125,921 |
Investments held in an unrealized loss position | The following tables provide summarized information with respect to investments held in an unrealized loss position at June 30, 2018 and December 31, 2017, including the length of time the investment had been held in a continuous unrealized loss position.
| June 30, 2018
| Total |  | Less than 12 months |  | 12 months or longer
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(In thousands) | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
Fixed maturities, available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 128,506 |  |  | $ | 2,380 |  |  | $ | 96,926 |  |  | $ | 1,589 |  |  | $ | 31,580 |  |  | $ | 791 |
U.S. Government-sponsored enterprise obligations | 30,769 |  |  | 650 |  |  | 23,960 |  |  | 397 |  |  | 6,809 |  |  | 253 |
State and municipal bonds | 100,622 |  |  | 1,093 |  |  | 98,073 |  |  | 1,035 |  |  | 2,549 |  |  | 58 |
Corporate debt | 919,141 |  |  | 22,390 |  |  | 801,410 |  |  | 17,525 |  |  | 117,731 |  |  | 4,865 |
Residential mortgage-backed securities | 173,133 |  |  | 4,966 |  |  | 131,124 |  |  | 2,839 |  |  | 42,009 |  |  | 2,127 |
Agency commercial mortgage-backed securities | 13,812 |  |  | 268 |  |  | 11,929 |  |  | 135 |  |  | 1,883 |  |  | 133 |
Other commercial mortgage-backed securities | 26,251 |  |  | 437 |  |  | 24,311 |  |  | 390 |  |  | 1,940 |  |  | 47 |
Other asset-backed securities | 155,165 |  |  | 1,665 |  |  | 141,632 |  |  | 1,474 |  |  | 13,533 |  |  | 191 |
| $ | 1,547,399 |  |  | $ | 33,849 |  |  | $ | 1,329,365 |  |  | $ | 25,384 |  |  | $ | 218,034 |  |  | $ | 8,465 |
| December 31, 2017
| Total |  | Less than 12 months |  | 12 months or longer
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(In thousands) | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
Fixed maturities, available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 110,788 |  |  | $ | 1,181 |  |  | $ | 67,135 |  |  | $ | 554 |  |  | $ | 43,653 |  |  | $ | 627 |
U.S. Government-sponsored enterprise obligations | 17,032 |  |  | 206 |  |  | 10,182 |  |  | 64 |  |  | 6,850 |  |  | 142 |
State and municipal bonds | 23,122 |  |  | 419 |  |  | 15,168 |  |  | 102 |  |  | 7,954 |  |  | 317 |
Corporate debt | 487,578 |  |  | 5,707 |  |  | 365,541 |  |  | 2,730 |  |  | 122,037 |  |  | 2,977 |
Residential mortgage-backed securities | 109,659 |  |  | 1,335 |  |  | 64,121 |  |  | 402 |  |  | 45,538 |  |  | 933 |
Agency commercial mortgage-backed securities | 4,423 |  |  | 108 |  |  | 2,458 |  |  | 34 |  |  | 1,965 |  |  | 74 |
Other commercial mortgage-backed securities | 12,878 |  |  | 134 |  |  | 7,939 |  |  | 82 |  |  | 4,939 |  |  | 52 |
Other asset-backed securities | 85,358 |  |  | 466 |  |  | 70,924 |  |  | 346 |  |  | 14,434 |  |  | 120 |
| $ | 850,838 |  |  | $ | 9,556 |  |  | $ | 603,468 |  |  | $ | 4,314 |  |  | $ | 247,370 |  |  | $ | 5,242 |
Information regarding sales and purchases of available-for-sale securities | Other information regarding sales and purchases of fixed maturity available-for-sale securities is as follows:
| Three Months Ended June 30 |  | Six Months Ended June 30
(In millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Proceeds from sales (exclusive of maturities and paydowns) | $ | 115.8 |  |  | $ | 156.3 |  |  | $ | 495.0 |  |  | $ | 235.5 |
Purchases | $ | 184.6 |  |  | $ | 198.7 |  |  | $ | 552.5 |  |  | $ | 359.1 |
Net Investment Income | Net investment income by investment category was as follows:
| Three Months Ended June 30 |  | Six Months Ended June 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Fixed maturities | $ | 17,506 |  |  | $ | 18,841 |  |  | $ | 34,586 |  |  | $ | 38,962 |
Equities | 4,998 |  |  | 4,298 |  |  | 9,865 |  |  | 7,942 |
Short-term investments, including Other | 1,332 |  |  | 978 |  |  | 2,639 |  |  | 1,778 |
BOLI | 455 |  |  | 442 |  |  | 904 |  |  | 897 |
Investment fees and expenses | (1,907 | ) |  | (1,882 | ) |  | (3,583 | ) |  | (3,716 | )
Net investment income | $ | 22,384 |  |  | $ | 22,677 |  |  | $ | 44,411 |  |  | $ | 45,863 |
Investments in unconsolidated subsidiaries | ProAssurance's investment in unconsolidated subsidiaries were as follows:
| June 30, 2018 |  | Carrying Value
(In thousands) | Percentage Ownership |  | June 30, 2018 |  | December 31, 2017
Qualified affordable housing project tax credit partnerships | See below |  | $ | 74,895 |  |  | $ | 84,607 |
Other tax credit partnerships | See below |  | 4,980 |  |  | 6,118 |
All other investments, primarily investment fund LPs/LLCs | See below |  | 310,339 |  |  | 239,866 |
|  |  | $ | 390,214 |  |  | $ | 330,591 |
Equity in Earnings (Loss) of Unconsolidated Subsidiaries [Table Text Block] | Losses recorded and tax credits recognized related to ProAssurance's tax credit partnership investments were as follows:
| Three Months Ended June 30 |  | Six Months Ended June 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Qualified affordable housing project tax credit partnerships |  |  |  |  |  |  |
Losses recorded | $ | 5,612 |  |  | $ | 3,964 |  |  | $ | 9,712 |  |  | $ | 7,272 |
Tax credits recognized | $ | 4,624 |  |  | $ | 4,612 |  |  | $ | 9,237 |  |  | $ | 9,225 |
Historic tax credit partnerships |  |  |  |  |  |  |
Losses recorded | $ | 1,506 |  |  | $ | 2,350 |  |  | $ | 3,382 |  |  | $ | 2,766 |
Tax credits recognized | $ | 693 |  |  | $ | 820 |  |  | $ | 1,355 |  |  | $ | 2,624 |
Net realized investment gains (losses) | Realized investment gains and losses are recognized on the first-in, first-out basis. The following table provides detailed information regarding net realized investment gains (losses):
| Three Months Ended June 30 |  | Six Months Ended June 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Total OTTI losses: |  |  |  |  |  |  |
Corporate debt | $ | (404 | ) |  | $ | — |  |  | $ | (404 | ) |  | $ | (419 | )
Portion of OTTI losses recognized in other comprehensive income before taxes: |  |  |  |  |  |  |
Corporate debt | — |  |  | — |  |  | — |  |  | 248 |
Net impairment losses recognized in earnings | (404 | ) |  | — |  |  | (404 | ) |  | (171 | )
Gross realized gains, available-for-sale fixed maturities | 438 |  |  | 746 |  |  | 4,902 |  |  | 2,599 |
Gross realized (losses), available-for-sale fixed maturities | (1,725 | ) |  | (1,401 | ) |  | (3,772 | ) |  | (1,468 | )
Net realized gains (losses), trading fixed maturities | (73 | ) |  | — |  |  | (73 | ) |  | — |
Net realized gains (losses), equity investments | 3,488 |  |  | 794 |  |  | 12,706 |  |  | 7,356 |
Net realized gains (losses), other investments | 402 |  |  | 546 |  |  | 1,090 |  |  | 1,719 |
Change in unrealized holding gains (losses), trading fixed maturities | (170 | ) |  | — |  |  | (219 | ) |  | — |
Change in unrealized holding gains (losses), equity investments | 745 |  |  | (3,191 | ) |  | (23,099 | ) |  | 424 |
Change in unrealized holding gains (losses), convertible securities, carried at fair value | 90 |  |  | 285 |  |  | (864 | ) |  | 598 |
Other | 4 |  |  | 2 |  |  | 11 |  |  | 4 |
Net realized investment gains (losses) | $ | 2,795 |  |  | $ | (2,219 | ) |  | $ | (9,722 | ) |  | $ | 11,061 |
Other than temporary impairment, credit losses recognized in earnings | The following table presents a roll forward of cumulative credit losses recorded in earnings related to impaired debt securities for which a portion of the OTTI was recorded in OCI.
| Three Months Ended June 30 |  | Six Months Ended June 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Balance beginning of period | $ | 1,313 |  |  | $ | 1,329 |  |  | $ | 1,313 |  |  | $ | 1,158 |
Additional credit losses recognized during the period, related to securities for which: |  |  |  |  |  |  |
No OTTI has been previously recognized | — |  |  | — |  |  | — |  |  | 171 |
Reductions due to: |  |  |  |  |  |  |
Securities sold during the period (realized) | — |  |  | (16 | ) |  | — |  |  | (16 | )
Balance June 30 | $ | 1,313 |  |  | $ | 1,313 |  |  | $ | 1,313 |  |  | $ | 1,313 |

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