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Shareholders' Equity | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Shareholders' Equity | Shareholders’ Equity At June 30, 2018 and December 31, 2017, ProAssurance had 100 million shares of authorized common stock and 50 million shares of authorized preferred stock. The Board has the authority to determine provisions for the issuance of preferred shares, including the number of shares to be issued, the designations, powers, preferences and rights, and the qualifications, limitations or restrictions of such shares. To date, the Board has not approved the issuance of preferred stock. ProAssurance declared cash dividends of $0.31 per share during each of the first two quarters of both 2018 and 2017, totaling $34.2 million and $33.0 million, for each respective six-month period. At June 30, 2018, Board authorizations for the repurchase of common shares or the retirement of outstanding debt of $109.6 million remained available for use. ProAssurance did no t repurchase any common shares during the six months ended June 30, 2018 and 2017. Share-based compensation expense and related tax benefits were as follows:
| Three Months Ended June 30 |  | Six Months Ended June 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Share-based compensation expense | $ | 1,615 |  |  | $ | 2,746 |  |  | $ | 2,517 |  |  | $ | 6,092 |
Related tax benefits | $ | 339 |  |  | $ | 961 |  |  | $ | 529 |  |  | $ | 2,132 |
ProAssurance awarded approximately 85,800 restricted share units and 27,200 base performance share units to employees in February 2018. The fair value of each unit awarded was estimated at $44.73, equal to the market value of a ProAssurance common share on the date of grant less the estimated present value of dividends during the vesting period. The majority of awards are charged to expense as an increase to additional paid-in capital over the service period (generally the vesting period) associated with the award. However, a nominal amount of awards are recorded as a liability as they are structured to be settled in cash. Restricted share units and performance share units vest in their entirety at the end of a three-year period following the grant date based on a continuous service requirement and, for performance share units, achievement of a performance objective. Partial vesting is permitted for retirees. For equity classified awards, a ProAssurance common share is issued for each unit once vesting requirements are met, except that units sufficient to satisfy required tax withholdings are paid in cash. The number of common shares issued for performance share units varies from 50% to 200% of base awards depending upon the degree to which stated performance objectives are achieved. ProAssurance issued approximately 52,800 and 80,600 common shares to employees in February 2018 related to restricted share units and performance share units, respectively, granted in 2015. Performance share units for the 2015 award were issued at a level of 125%. Liability classified awards, which are nominal in amount, are settled in cash at the end of the vesting period. ProAssurance issued approximately 2,500 common shares to employees in February 2018 as bonus compensation, as approved by the Compensation Committee of the Board. The shares issued were valued at fair value (the market price of a ProAssurance common share on the date of award). Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) For the three and six months ended June 30, 2018 and 2017, OCI was almost entirely comprised of unrealized gains and losses, including non-credit impairment losses, arising during the period related to fixed maturity available-for-sale securities, less reclassification adjustments, as shown in the table that follows, net of tax. For the three and six months ended June 30, 2018 and 2017, OCI included changes related to the reestimation of the defined benefit plan liability assumed in the Eastern acquisition which were nominal in amount. The defined benefit plan is frozen as to the earnings of additional benefits and the benefit plan liability is reestimated annually. At June 30, 2018 and December 31, 2017, AOCI was almost entirely comprised of accumulated unrealized gains and losses from fixed maturity available-for-sale securities, including accumulated non-credit impairments recognized through OCI of $0.6 million and $0.5 million, respectively, net of tax. At June 30, 2018 and December 31, 2017, accumulated changes in the defined benefit plan liability not yet recognized in earnings were nominal in amount. Due to the adoption of accounting guidance in the first quarter of 2018 related to certain impacts of the TCJA, ProAssurance increased AOCI by approximately $3.4 million with a corresponding decrease to retained earnings of the same amount as of the beginning of 2018. See Note 1 for additional information on accounting guidance adopted during the period. At June 30, 2018 and December 31, 2017, tax effects were computed using the enacted federal corporate tax rate of 21% and 35%, respectively, with the exception of unrealized gains and losses on available-for-sale securities held at our U.K. and Cayman Islands entities which in both periods were immaterial in amount. Amounts reclassified from AOCI to net income and the amounts of deferred tax expense (benefit) included in OCI were as follows:
| Three Months Ended June 30 |  | Six Months Ended June 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Reclassifications from AOCI to net income: |  |  |  |  |  |  |
Realized investment gains (losses) | $ | (1,691 | ) |  | $ | (653 | ) |  | $ | 726 |  |  | $ | 963 |
Non-credit impairment losses reclassified to earnings, due to sale of securities or reclassification as a credit loss | — |  |  | (3 | ) |  | — |  |  | (3 | )
Total gains (losses) reclassified, before tax effect | (1,691 | ) |  | (656 | ) |  | 726 |  |  | 960 |
Tax effect* | 355 |  |  | 230 |  |  | (153 | ) |  | (336 | )
Net reclassification adjustments | $ | (1,336 | ) |  | $ | (426 | ) |  | $ | 573 |  |  | $ | 624 |
Deferred tax expense (benefit) included in OCI | $ | (2,185 | ) |  | $ | 2,983 |  |  | $ | (9,245 | ) |  | $ | 4,464 |
* Tax effects were computed using a 21% and 35% rate for the three and six months ended June 30, 2018 and 2017, respectively.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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