Retroactive Insurance	6 Months Ended
Jun. 30, 2018
Insurance [Abstract]
Retroactive Insurance	Retroactive Insurance Contracts ProAssurance offers custom alternative risk solutions including loss portfolio transfers for large healthcare entities who, most commonly, are exiting a line of business, changing an insurance approach or simply preferring to transfer risk. A loss portfolio transfer is a form of retroactive insurance coverage as the Company is assuming and accepting an entity’s existing open and future claim liabilities through the transfer of the entity’s loss reserves. In the second quarter of 2018, ProAssurance entered into a loss portfolio transfer with a large healthcare organization. Per the agreement, ProAssurance will cover a specific inventory of existing claims as well as provide tail coverage. As the contract included both prospective (tail) coverage and retroactive coverage, ProAssurance bifurcated the provisions of the contract and accounted for each component separately. As of the contract effective date, ProAssurance recognized total net premiums written and earned of $26.6 million, comprised of $7.9 million of prospective coverage and $18.7 million of retroactive coverage, and total net losses and loss adjustment expenses of $25.4 million in the Condensed Consolidated Statements of Income and Comprehensive Income for the three and six months ended June 30, 2018. In addition, ProAssurance recorded a deferred gain of $0.6 million in the reserve for losses and loss adjustment expenses on the Condensed Consolidated Balance Sheet as of June 30, 2018 representing the excess of premiums received over losses assumed related to the retroactive coverage which will be amortized into earnings over the estimated claim payment period. For additional information regarding ProAssurance's accounting policy for retroactive insurance contracts, see Note 1.

Retroactive Insurance Contracts

ProAssurance offers custom alternative risk solutions including loss portfolio transfers for large healthcare entities who, most commonly, are exiting a line of business, changing an insurance approach or simply preferring to transfer risk. A loss portfolio transfer is a form of retroactive insurance coverage as the Company is assuming and accepting an entity’s existing open and future claim liabilities through the transfer of the entity’s loss reserves.

In the second quarter of 2018, ProAssurance entered into a loss portfolio transfer with a large healthcare organization. Per the agreement, ProAssurance will cover a specific inventory of existing claims as well as provide tail coverage. As the contract included both prospective (tail) coverage and retroactive coverage, ProAssurance bifurcated the provisions of the contract and accounted for each component separately. As of the contract effective date, ProAssurance recognized total net premiums written and earned of $26.6 million, comprised of $7.9 million of prospective coverage and $18.7 million of retroactive coverage, and total net losses and loss adjustment expenses of $25.4 million in the Condensed Consolidated Statements of Income and Comprehensive Income for the three and six months ended June 30, 2018. In addition, ProAssurance recorded a deferred gain of $0.6 million in the reserve for losses and loss adjustment expenses on the Condensed Consolidated Balance Sheet as of June 30, 2018 representing the excess of premiums received over losses assumed related to the retroactive coverage which will be amortized into earnings over the estimated claim payment period. For additional information regarding ProAssurance's accounting policy for retroactive insurance contracts, see Note 1.