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Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Assets | Fair values of assets measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020 are shown in the following tables. Where applicable, the tables also indicate the fair value hierarchy of the valuation techniques utilized to determine those fair values. For some assets, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. When this is the case, the asset is categorized based on the level of the most significant input to the fair value measurement. Assessments of the significance of a particular input to the fair value measurement require judgment and consideration of factors specific to the assets being valued.
| September 30, 2021
| Fair Value Measurements Using |  | Total
(In thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
Assets: |  |  |  |  |  |  |
Fixed maturities, available-for-sale |  |  |  |  |  |  |
U.S. Treasury obligations | $ | — |  |  | $ | 242,705 |  |  | $ | — |  |  | $ | 242,705 |
U.S. Government-sponsored enterprise obligations | — |  |  | 20,468 |  |  | — |  |  | 20,468 |
State and municipal bonds | — |  |  | 522,707 |  |  | — |  |  | 522,707 |
Corporate debt, multiple observable inputs | — |  |  | 1,943,401 |  |  | — |  |  | 1,943,401 |
Corporate debt, limited observable inputs | — |  |  | — |  |  | 19,712 |  |  | 19,712 |
Residential mortgage-backed securities | — |  |  | 473,674 |  |  | 4,235 |  |  | 477,909 |
Agency commercial mortgage-backed securities | — |  |  | 14,942 |  |  | — |  |  | 14,942 |
Other commercial mortgage-backed securities | — |  |  | 219,024 |  |  | — |  |  | 219,024 |
Other asset-backed securities | — |  |  | 432,261 |  |  | 11,007 |  |  | 443,268 |
Fixed maturities, trading | — |  |  | 45,049 |  |  | — |  |  | 45,049 |
Equity investments |  |  |  |  |  |  |
Financial | — |  |  | 868 |  |  | — |  |  | 868 |
Utilities/Energy | — |  |  | — |  |  | 69 |  |  | 69 |
Industrial | — |  |  | — |  |  | 2,500 |  |  | 2,500 |
Bond funds | 191,834 |  |  | — |  |  | — |  |  | 191,834 |
All other | 19,259 |  |  | — |  |  | — |  |  | 19,259 |
Short-term investments | 112,706 |  |  | 39,002 |  |  | — |  |  | 151,708 |
Other investments | 1,864 |  |  | 104,978 |  |  | — |  |  | 106,842 |
Other assets | — |  |  | 601 |  |  | — |  |  | 601 |
Total assets categorized within the fair value hierarchy | $ | 325,663 |  |  | $ | 4,059,680 |  |  | $ | 37,523 |  |  | 4,422,866 |
Assets carried at NAV, which approximates fair value and which are not categorized within the fair value hierarchy, reported as a part of: |  |  |  |  |  |  |
Investment in unconsolidated subsidiaries |  |  |  |  |  |  | 251,675 |
Total assets at fair value |  |  |  |  |  |  | $ | 4,674,541 |
Liabilities: |  |  |  |  |  |  |
Other liabilities | $ | — |  |  | $ | — |  |  | $ | 24,000 |  |  | $ | 24,000 |
Total liabilities categorized within the fair value hierarchy | $ | — |  |  | $ | — |  |  | $ | 24,000 |  |  | $ | 24,000 |
| December 31, 2020
| Fair Value Measurements Using |  | Total
(In thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
Assets: |  |  |  |  |  |  |
Fixed maturities, available-for-sale |  |  |  |  |  |  |
U.S. Treasury obligations | $ | — |  |  | $ | 107,059 |  |  | $ | — |  |  | $ | 107,059 |
U.S. Government-sponsored enterprise obligations | — |  |  | 12,261 |  |  | — |  |  | 12,261 |
State and municipal bonds | — |  |  | 332,920 |  |  | — |  |  | 332,920 |
Corporate debt, multiple observable inputs | — |  |  | 1,326,077 |  |  | — |  |  | 1,326,077 |
Corporate debt, limited observable inputs | — |  |  | — |  |  | 3,265 |  |  | 3,265 |
Residential mortgage-backed securities | — |  |  | 274,509 |  |  | 2,032 |  |  | 276,541 |
Agency commercial mortgage-backed securities | — |  |  | 13,310 |  |  | — |  |  | 13,310 |
Other commercial mortgage-backed securities | — |  |  | 113,092 |  |  | — |  |  | 113,092 |
Other asset-backed securities | — |  |  | 266,345 |  |  | 6,661 |  |  | 273,006 |
Fixed maturities, trading | — |  |  | 48,456 |  |  | — |  |  | 48,456 |
Equity investments |  |  |  |  |  |  |
Financial | 13,810 |  |  | — |  |  | — |  |  | 13,810 |
Utilities/Energy | 564 |  |  | — |  |  | — |  |  | 564 |
Consumer oriented | 1,262 |  |  | — |  |  | — |  |  | 1,262 |
Industrial | 2,240 |  |  | — |  |  | — |  |  | 2,240 |
Bond funds | 69,475 |  |  | — |  |  | — |  |  | 69,475 |
All other | 20,202 |  |  | — |  |  | — |  |  | 20,202 |
Short-term investments | 307,695 |  |  | 30,118 |  |  | — |  |  | 337,813 |
Other investments | 1,509 |  |  | 42,607 |  |  | — |  |  | 44,116 |
Other assets | — |  |  | 329 |  |  | — |  |  | 329 |
Total assets categorized within the fair value hierarchy | $ | 416,757 |  |  | $ | 2,567,083 |  |  | $ | 11,958 |  |  | 2,995,798 |
Assets carried at NAV, which approximates fair value and which are not categorized within the fair value hierarchy, reported as a part of: |  |  |  |  |  |  |
Equity investments |  |  |  |  |  |  | 12,548 |
Investment in unconsolidated subsidiaries |  |  |  |  |  |  | 233,711 |
Total assets at fair value |  |  |  |  |  |  | $ | 3,242,057 |
Schedule of Quantitative Information Regarding Level 3 Valuations | Quantitative Information Regarding Level 3 Valuations
|  | Fair Value at |  |  |  |  |  |
($ in thousands) |  | September 30, 2021 |  | December 31, 2020 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average)
Assets: |  |  |  |  |  |  |  |  |  |
Corporate debt, limited observable inputs |  | $19,712 |  | $3,265 |  | Market Comparable Securities |  | Comparability Adjustment |  | 0% - 5% (2.5%)
|  |  |  |  |  | Discounted Cash Flows |  | Comparability Adjustment |  | 0% - 5% (2.5%)
Residential mortgage-backed securities |  | $4,235 |  | $2,032 |  | Market Comparable Securities |  | Comparability Adjustment |  | 0% - 5% (2.5%)
|  |  |  |  |  | Discounted Cash Flows |  | Comparability Adjustment |  | 0% - 5% (2.5%)
Other asset-backed securities |  | $11,007 |  | $6,661 |  | Market Comparable Securities |  | Comparability Adjustment |  | 0% - 5% (2.5%)
|  |  |  |  |  | Discounted Cash Flows |  | Comparability Adjustment |  | 0% - 5% (2.5%)
Equity securities |  | $2,569 |  | $— |  | Discounted Cash Flows |  | Comparability Adjustment |  | 0% - 10% (5%)
Liabilities: |  |  |  |  |  |  |  |  |  |
Other liabilities |  | $24,000 |  | $— |  | Stochastic Model/Discounted Cash Flows |  | N/A |  | 0% - 10% (8%)
Schedule of Fair Value Measurements - Level 3 Assets | The following tables present summary information regarding changes in the fair value of assets measured using Level 3 inputs.
|  |  |  |  | September 30, 2021
|  |  |  |  | Level 3 Fair Value Measurements - Assets
(In thousands) |  |  |  |  | Corporate Debt |  | Asset-backed Securities |  | Equity Securities |  | Other Investments |  | Total |  |
Balance, June 30, 2021 |  |  |  |  | $ | 15,065 |  |  | $ | 9,857 |  |  | $ | 852 |  |  | $ | 2,222 |  |  | $ | 27,996 |  |  |
Total gains (losses) realized and unrealized: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings, as a part of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized investment gains (losses) |  |  |  |  | — |  |  | — |  |  | (2) |  |  | (639) |  |  | (641) |  |  |
Included in other comprehensive income |  |  |  |  | 49 |  |  | (74) |  |  | 18 |  |  | — |  |  | (7) |  |  |
Purchases |  |  |  |  | 10,881 |  |  | 12,666 |  |  | 2,500 |  |  | — |  |  | 26,047 |  |  |
Sales |  |  |  |  | (284) |  |  | (17) |  |  | — |  |  | — |  |  | (301) |  |  |
Transfers in |  |  |  |  | — |  |  | — |  |  | 69 |  |  | — |  |  | 69 |  |  |
Transfers out |  |  |  |  | (5,999) |  |  | (7,190) |  |  | (868) |  |  | (1,583) |  |  | (15,640) |  |  |
Balance, September 30, 2021 |  |  |  |  | $ | 19,712 |  |  | $ | 15,242 |  |  | $ | 2,569 |  |  | $ | — |  |  | $ | 37,523 |  |  |
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | (1) |  |  | $ | (639) |  |  | $ | (640) |  |  |
|  |  |  |  | September 30, 2021
|  |  |  |  | Level 3 Fair Value Measurements - Assets
(In thousands) |  |  |  |  | Corporate Debt |  | Asset-backed Securities |  | Equity Securities |  | Other Investments |  | Total |  |
Balance, December 31, 2020 |  |  |  |  | $ | 3,265 |  |  | $ | 8,693 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,958 |  |  |
Total gains (losses) realized and unrealized: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings, as a part of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  | 1 |  |  | (2) |  |  | — |  |  | — |  |  | (1) |  |  |
Net realized investment gains (losses) |  |  |  |  | — |  |  | (11) |  |  | (1) |  |  | (774) |  |  | (786) |  |  |
Included in other comprehensive income |  |  |  |  | 82 |  |  | (171) |  |  | 16 |  |  | — |  |  | (73) |  |  |
Purchases |  |  |  |  | 24,971 |  |  | 28,026 |  |  | 9,083 |  |  | 205 |  |  | 62,285 |  |  |
Sales |  |  |  |  | (461) |  |  | (506) |  |  | (5,730) |  |  | — |  |  | (6,697) |  |  |
Transfers in |  |  |  |  | 858 |  |  | — |  |  | 69 |  |  | 2,152 |  |  | 3,079 |  |  |
Transfers out |  |  |  |  | (9,004) |  |  | (20,787) |  |  | (868) |  |  | (1,583) |  |  | (32,242) |  |  |
Balance, September 30, 2021 |  |  |  |  | $ | 19,712 |  |  | $ | 15,242 |  |  | $ | 2,569 |  |  | $ | — |  |  | $ | 37,523 |  |  |
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | (1) |  |  | $ | (774) |  |  | $ | (775) |  |  |
|  |  |  |  | September 30, 2020
|  |  |  |  | Level 3 Fair Value Measurements – Assets
(In thousands) |  |  |  |  | Corporate Debt |  | Asset-backed Securities |  | Other Investments |  | Total
Balance, June 30, 2020 |  |  |  |  | $ | 3,117 |  |  | $ | 5,978 |  |  | $ | 1,568 |  |  | $ | 10,663 |
Total gains (losses) realized and unrealized: |  |  |  |  |  |  |  |  |  |  |
Included in earnings, as a part of: |  |  |  |  |  |  |  |  |  |  |
Net realized investment gains (losses) |  |  |  |  | — |  |  | (2) |  |  | 143 |  |  | 141 |
Included in other comprehensive income |  |  |  |  | (6) |  |  | (58) |  |  | — |  |  | (64) |
Purchases |  |  |  |  | 900 |  |  | 8,513 |  |  | — |  |  | 9,413 |
Sales |  |  |  |  | (16) |  |  | (99) |  |  | — |  |  | (115) |
Transfers out |  |  |  |  | — |  |  | (1,378) |  |  | (1,711) |  |  | (3,089) |
Balance, September 30, 2020 |  |  |  |  | $ | 3,995 |  |  | $ | 12,954 |  |  | $ | — |  |  | $ | 16,949 |
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | 143 |  |  | $ | 143 |
|  |  |  |  | September 30, 2020
|  |  |  |  | Level 3 Fair Value Measurements – Assets
(In thousands) |  |  |  |  | Corporate Debt |  | Asset-backed Securities |  | Other Investments |  | Total
Balance, December 31, 2019 |  |  |  |  | $ | 5,079 |  |  | $ | 2,992 |  |  | $ | 3,086 |  |  | $ | 11,157 |
Total gains (losses) realized and unrealized: |  |  |  |  |  |  |  |  |  |  |
Included in earnings, as a part of: |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  | — |  |  | (10) |  |  | — |  |  | (10) |
Net realized investment gains (losses) |  |  |  |  | — |  |  | (2) |  |  | 151 |  |  | 149 |
Included in other comprehensive income |  |  |  |  | 38 |  |  | 23 |  |  | — |  |  | 61 |
Purchases |  |  |  |  | 900 |  |  | 13,341 |  |  | — |  |  | 14,241 |
Sales |  |  |  |  | (2,173) |  |  | (888) |  |  | — |  |  | (3,061) |
Transfers in |  |  |  |  | 945 |  |  | 605 |  |  | — |  |  | 1,550 |
Transfers out |  |  |  |  | (794) |  |  | (3,107) |  |  | (3,237) |  |  | (7,138) |
Balance, September 30, 2020 |  |  |  |  | $ | 3,995 |  |  | $ | 12,954 |  |  | $ | — |  |  | $ | 16,949 |
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | 151 |  |  | $ | 151 |
Schedule of Investments in LLCs and Limited Partnerships | The amount of ProAssurance's unfunded commitments related to these investments as of September 30, 2021 and fair values of these investments as of September 30, 2021 and December 31, 2020 were as follows:
| Unfunded Commitments |  | Fair Value
(In thousands) | September 30, 2021 |  | September 30, 2021 |  | December 31, 2020
Equity investments: |  |  |  |  |
Mortgage fund (1) | None |  | $ | — |  |  | $ | 12,548 |
Investment in unconsolidated subsidiaries: |  |  |  |  |
Private debt funds (2) | $8,929 |  | 18,523 |  |  | 16,387 |
Long/short equity funds (3) | None |  | 533 |  |  | 596 |
Non-public equity funds (4) | $38,713 |  | 144,539 |  |  | 138,357 |
Credit funds (5) | $41,123 |  | 43,125 |  |  | 34,848 |
Strategy focused funds (6) | $34,988 |  | 44,955 |  |  | 43,523 |
|  |  | 251,675 |  |  | 233,711 |
Total investments carried at NAV |  |  | $ | 251,675 |  |  | $ | 246,259 |
Below is additional information regarding each of the investments listed in the table above as of September 30, 2021. (1)This investment fund was focused on the structured mortgage market. The fund primarily invested in U.S. Agency mortgage-backed securities. Redemptions are allowed at the end of any calendar quarter with a prior notice requirement of 65 days and are paid within 45 days at the end of the redemption dealing day. (2)This investment is comprised of interests in two unrelated LP funds that are structured to provide interest distributions primarily through diversified portfolios of private debt instruments. One LP allows redemption by special consent, while the other does not permit redemption. Income and capital are to be periodically distributed at the discretion of the LPs over an anticipated time frame that spans from three to eight years. (3)This investment holds primarily long and short North American equities and targets absolute returns using strategies designed to take advantage of market opportunities. Redemptions are permitted; however, redemptions above specified thresholds (lowest threshold is 90%) may be only partially payable until after a fund audit is completed and are then payable within 30 days. (4)This investment is comprised of interests in multiple unrelated LP funds, each structured to provide capital appreciation through diversified investments in private equity, which can include investments in buyout, venture capital, debt including senior, second lien and mezzanine, distressed debt, collateralized loan obligations and other private equity-oriented LPs. Two of the LPs allow redemption by terms set forth in the LP agreements; the others do not permit redemption. Income and capital are to be periodically distributed at the discretion of the LP over time frames that are anticipated to span up to ten years. (5)This investment is comprised of multiple unrelated LP funds. Two funds seek to obtain superior risk-adjusted absolute returns through a diversified portfolio of debt securities, including bonds, loans and other asset-backed instruments. The remaining funds focus on private middle market company mezzanine and senior secured loans, opportunities across the credit spectrum, mortgage backed-loans, as well as various types of loan-backed investments. Three of the funds allow redemptions at any quarter-end with prior notice requirements that vary from 90 to 180 days, while another fund allows for redemptions with consent of the General Partner. The remaining funds do not allow redemptions. For the funds that do not allow redemptions, income and capital are to be periodically distributed at the discretion of the LP over time frames throughout the remaining life of the funds. (6) This investment is comprised of multiple unrelated LPs/LLCs funds. One fund is an LLC focused on investing in North American consumer products companies, comprised of equity and equity-related securities, as well as debt instruments. A second fund is focused on aircraft investments, along with components and assets related to aircrafts. For both funds, redemptions are not permitted. Another fund is an LP focused on North American energy infrastructure assets that allows redemption with consent of the General Partner. The remaining funds are real estate focused LPs, one of which allows for redemption with prior notice.
Schedule of Financial Instruments Not Measured at Fair Value | The following table provides the estimated fair value of the Company's financial instruments that, in accordance with GAAP for the type of investment, are measured using a methodology other than fair value. Fair values provided primarily fall within the Level 3 fair value category.
| September 30, 2021 |  | December 31, 2020
(In thousands) | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Financial assets: |  |  |  |  |  |  |
BOLI | $ | 80,821 |  |  | $ | 80,821 |  |  | $ | 67,847 |  |  | $ | 67,847 |
Other investments | $ | 3,170 |  |  | $ | 3,170 |  |  | $ | 2,952 |  |  | $ | 2,952 |
Other assets | $ | 39,584 |  |  | $ | 39,593 |  |  | $ | 31,128 |  |  | $ | 31,141 |
Financial liabilities: |  |  |  |  |  |  |
Senior notes due 2023* | $ | 250,000 |  |  | $ | 267,988 |  |  | $ | 250,000 |  |  | $ | 269,160 |
Mortgage Loans* | $ | — |  |  | $ | — |  |  | $ | 36,113 |  |  | $ | 36,113 |
Contribution Certificates | $ | 175,766 |  |  | $ | 178,728 |  |  | $ | — |  |  | $ | — |
Other liabilities | $ | 51,456 |  |  | $ | 51,456 |  |  | $ | 30,334 |  |  | $ | 30,334 |
* Carrying value excludes unamortized debt issuance costs.

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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