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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | Financial results by segment were as follows:
| Three Months Ended June 30, 2018
(In thousands) | Specialty P&C |  | Workers' Compensation |  | Lloyd's Syndicates |  | Corporate |  | Inter-segment Eliminations |  | Consolidated
Net premiums earned | $ | 143,847 |  |  | $ | 62,254 |  |  | $ | 17,490 |  |  | $ | — |  |  | $ | — |  |  | $ | 223,591 |
Net investment income | — |  |  | — |  |  | 836 |  |  | 21,548 |  |  | — |  |  | 22,384 |
Equity in earnings (loss) of unconsolidated subsidiaries | — |  |  | — |  |  | — |  |  | 5,380 |  |  | — |  |  | 5,380 |
Net realized gains (losses) | — |  |  | — |  |  | (252 | ) |  | 3,047 |  |  | — |  |  | 2,795 |
Other income (expense) | 1,262 |  |  | 212 |  |  | (436 | ) |  | 1,095 |  |  | (89 | ) |  | 2,044 |
Net losses and loss adjustment expenses | (111,838 | ) |  | (37,385 | ) |  | (12,505 | ) |  | — |  |  | — |  |  | (161,728 | )
Underwriting, policy acquisition and operating expenses | (28,050 | ) |  | (17,969 | ) |  | (8,060 | ) |  | (5,621 | ) |  | 89 |  |  | (59,611 | )
Segregated portfolio cells dividend (expense) income | (118 | ) |  | (2,751 | ) |  | — |  |  | 84 |  |  | — |  |  | (2,785 | )
Interest expense | — |  |  | — |  |  | — |  |  | (3,958 | ) |  | — |  |  | (3,958 | )
Income tax benefit (expense) | — |  |  | — |  |  | — |  |  | 311 |  |  | — |  |  | 311 |
Segment operating results | $ | 5,103 |  |  | $ | 4,361 |  |  | $ | (2,927 | ) |  | $ | 21,886 |  |  | $ | — |  |  | $ | 28,423 |
Significant non-cash items: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization, net of accretion | $ | 1,761 |  |  | $ | 958 |  |  | $ | (2 | ) |  | $ | 2,240 |  |  | $ | — |  |  | $ | 4,957 |
| Six Months Ended June 30, 2018
(In thousands) | Specialty P&C |  | Workers' Compensation |  | Lloyd's Syndicates |  | Corporate |  | Inter-segment Eliminations |  | Consolidated
Net premiums earned | $ | 260,125 |  |  | $ | 120,660 |  |  | $ | 29,965 |  |  | $ | — |  |  | $ | — |  |  | $ | 410,750 |
Net investment income | — |  |  | — |  |  | 1,587 |  |  | 42,824 |  |  | — |  |  | 44,411 |
Equity in earnings (loss) of unconsolidated subsidiaries | — |  |  | — |  |  | — |  |  | 7,019 |  |  | — |  |  | 7,019 |
Net realized gains (losses) | — |  |  | — |  |  | (306 | ) |  | (9,416 | ) |  | — |  |  | (9,722 | )
Other income (expense) | 2,519 |  |  | 578 |  |  | (105 | ) |  | 2,037 |  |  | (262 | ) |  | 4,767 |
Net losses and loss adjustment expenses | (196,425 | ) |  | (74,099 | ) |  | (20,991 | ) |  | — |  |  | — |  |  | (291,515 | )
Underwriting, policy acquisition and operating expenses | (56,327 | ) |  | (35,301 | ) |  | (15,306 | ) |  | (10,297 | ) |  | 262 |  |  | (116,969 | )
Segregated portfolio cells dividend (expense) income | (88 | ) |  | (4,645 | ) |  | — |  |  | 201 |  |  | — |  |  | (4,532 | )
Interest expense | — |  |  | — |  |  | — |  |  | (7,663 | ) |  | — |  |  | (7,663 | )
Income tax benefit (expense) | — |  |  | — |  |  | (6 | ) |  | 3,739 |  |  | — |  |  | 3,733 |
Segment operating results | $ | 9,804 |  |  | $ | 7,193 |  |  | $ | (5,162 | ) |  | $ | 28,444 |  |  | $ | — |  |  | $ | 40,279 |
Significant non-cash items: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization, net of accretion | $ | 3,628 |  |  | $ | 1,914 |  |  | $ | (3 | ) |  | $ | 5,497 |  |  | $ | — |  |  | $ | 11,036 |
| Three Months Ended June 30, 2017
(In thousands) | Specialty P&C |  | Workers' Compensation |  | Lloyd's Syndicates |  | Corporate |  | Inter-segment Eliminations |  | Consolidated
Net premiums earned | $ | 109,005 |  |  | $ | 56,854 |  |  | $ | 14,494 |  |  | $ | — |  |  | $ | — |  |  | $ | 180,353 |
Net investment income | — |  |  | — |  |  | 410 |  |  | 22,267 |  |  | — |  |  | 22,677 |
Equity in earnings (loss) of unconsolidated subsidiaries | — |  |  | — |  |  | — |  |  | 2,516 |  |  | — |  |  | 2,516 |
Net realized gains (losses) | — |  |  | — |  |  | 47 |  |  | (2,266 | ) |  | — |  |  | (2,219 | )
Other income (expense) | 1,469 |  |  | 209 |  |  | (151 | ) |  | 778 |  |  | (55 | ) |  | 2,250 |
Net losses and loss adjustment expenses | (71,296 | ) |  | (33,486 | ) |  | (10,768 | ) |  | — |  |  | — |  |  | (115,550 | )
Underwriting, policy acquisition and operating expenses | (26,239 | ) |  | (17,093 | ) |  | (6,851 | ) |  | (7,757 | ) |  | 55 |  |  | (57,885 | )
Segregated portfolio cells dividend (expense) income (1) | (5,119 | ) |  | (2,698 | ) |  | — |  |  | (994 | ) |  | — |  |  | (8,811 | )
Interest expense | — |  |  | — |  |  | — |  |  | (4,145 | ) |  | — |  |  | (4,145 | )
Income tax benefit (expense)(1) | — |  |  | — |  |  | 548 |  |  | (216 | ) |  | — |  |  | 332 |
Segment operating results | $ | 7,820 |  |  | $ | 3,786 |  |  | $ | (2,271 | ) |  | $ | 10,183 |  |  | $ | — |  |  | $ | 19,518 |
Significant non-cash items: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization, net of accretion | $ | 1,506 |  |  | $ | 831 |  |  | $ | (5 | ) |  | $ | 3,814 |  |  | $ | — |  |  | $ | 6,146 |
| Six Months Ended June 30, 2017
(In thousands) | Specialty P&C |  | Workers' Compensation |  | Lloyd's Syndicates |  | Corporate |  | Inter-segment Eliminations |  | Consolidated
Net premiums earned | $ | 222,063 |  |  | $ | 112,137 |  |  | $ | 29,056 |  |  | $ | — |  |  | $ | — |  |  | $ | 363,256 |
Net investment income | — |  |  | — |  |  | 782 |  |  | 45,081 |  |  | — |  |  | 45,863 |
Equity in earnings (loss) of unconsolidated subsidiaries | — |  |  | — |  |  | — |  |  | 4,324 |  |  | — |  |  | 4,324 |
Net realized gains (losses) | — |  |  | — |  |  | 74 |  |  | 10,987 |  |  | — |  |  | 11,061 |
Other income (expense) | 2,668 |  |  | 354 |  |  | 240 |  |  | 951 |  |  | (142 | ) |  | 4,071 |
Net losses and loss adjustment expenses | (146,291 | ) |  | (68,136 | ) |  | (20,274 | ) |  | — |  |  | — |  |  | (234,701 | )
Underwriting, policy acquisition and operating expenses | (52,217 | ) |  | (33,784 | ) |  | (13,062 | ) |  | (16,073 | ) |  | 142 |  |  | (114,994 | )
Segregated portfolio cells dividend (expense) income (1) | (5,091 | ) |  | (3,872 | ) |  | — |  |  | (2,223 | ) |  | — |  |  | (11,186 | )
Interest expense | — |  |  | — |  |  | — |  |  | (8,278 | ) |  | — |  |  | (8,278 | )
Income tax benefit (expense)(1) | — |  |  | — |  |  | 555 |  |  | 1,002 |  |  | — |  |  | 1,557 |
Segment operating results | $ | 21,132 |  |  | $ | 6,699 |  |  | $ | (2,629 | ) |  | $ | 35,771 |  |  | $ | — |  |  | $ | 60,973 |
Significant non-cash items: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization, net of accretion | $ | 3,417 |  |  | $ | 1,668 |  |  | $ | (8 | ) |  | $ | 8,872 |  |  | $ | — |  |  | $ | 13,949 |
(1) During the second quarter of 2017, ProAssurance recognized a $5.2 million pre-tax expense related to previously unrecognized SPC dividend expense for the cumulative earnings of unrelated parties that have owned segregated portfolio cells at various periods since 2003 in a Bermuda captive insurance operation managed by the Company's HCPL line of business within the Specialty P&C segment. The expense recorded in the second quarter of 2017 related to periods prior to the then current period and was unrelated to the captive operations of the Company's Eastern Re subsidiary. The $1.8 million tax impact of the expense recognized in the second quarter of 2017 was included in the Corporate segment's income tax benefit (expense).
Schedule of Gross Premiums by Product | The following table provides detailed information regarding ProAssurance's gross premiums earned by product as well as a reconciliation to net premiums earned. All gross premiums earned are from external customers except as noted. ProAssurance's insured risks are primarily within the U.S.
| Three Months Ended June 30 |  | Six Months Ended June 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Specialty P&C Segment |  |  |  |  |  |  |
Gross premiums earned: |  |  |  |  |  |  |
Healthcare professional liability | $ | 146,208 |  |  | $ | 115,781 |  |  | $ | 264,892 |  |  | $ | 232,832 |
Legal professional liability | 6,489 |  |  | 6,417 |  |  | 12,880 |  |  | 12,734 |
Medical technology liability | 8,780 |  |  | 8,389 |  |  | 17,292 |  |  | 16,701 |
Other | 119 |  |  | 101 |  |  | 230 |  |  | 203 |
Ceded premiums earned | (17,749 | ) |  | (21,683 | ) |  | (35,169 | ) |  | (40,407 | )
Segment net premiums earned | 143,847 |  |  | 109,005 |  |  | 260,125 |  |  | 222,063 |
Workers' Compensation Segment |  |  |  |  |  |  |
Gross premiums earned: |  |  |  |  |  |  |
Traditional business | 48,632 |  |  | 42,501 |  |  | 94,662 |  |  | 84,269 |
Alternative market business | 20,648 |  |  | 20,209 |  |  | 40,029 |  |  | 39,655 |
Ceded premiums earned | (7,026 | ) |  | (5,856 | ) |  | (14,031 | ) |  | (11,787 | )
Segment net premiums earned | 62,254 |  |  | 56,854 |  |  | 120,660 |  |  | 112,137 |
Lloyd's Syndicates Segment |  |  |  |  |  |  |
Gross premiums earned: |  |  |  |  |  |  |
Property and casualty* | 19,273 |  |  | 16,960 |  |  | 37,240 |  |  | 34,145 |
Ceded premiums earned | (1,783 | ) |  | (2,466 | ) |  | (7,275 | ) |  | (5,089 | )
Segment net premiums earned | 17,490 |  |  | 14,494 |  |  | 29,965 |  |  | 29,056 |
Consolidated net premiums earned | $ | 223,591 |  |  | $ | 180,353 |  |  | $ | 410,750 |  |  | $ | 363,256 |
*Includes premium assumed from the Specialty P&C segment of $1.4 million and $3.3 million for the three and six months ended June 30, 2018, respectively, and $3.1 million and $6.6 million for the same respective periods of 2017.

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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