Taxes	3 Months Ended
Mar. 31, 2018
Taxes [Abstract]
Taxes	(7) Taxes: As of March 31, 2018, the Company's calendar years 2016, 2015 and 2014 remain subject to examination by the Internal Revenue Service. The effective federal tax rate on consolidated income for the three months ended March 31, 2018 was (5.1%) compared to 33.6% for the three months ended March 31, 2017. The effective federal income tax rate differs from the normal statutory rate primarily as a result of tax-exempt investment income. The effective tax rate for the three months ended March 31, 2018 was also impacted by the change in accounting for unrealized gains and losses on equity securities related to the adoption of ASU 2016-01 where changes in unrealized, and the corresponding tax effects, are now recorded in the condensed consolidated statement of income. The Company recorded an unrealized loss, and corresponding tax benefit, related to equity securities during the three months ended March 31, 2018. Additionally, the decrease also reflects the reduced federal corporate income tax rate as a result of the enactment of the U.S. Tax Act in December 2017. The Company continues to analyze the different aspects of the U.S. Tax Act, which could potentially affect the provisional estimates that were recorded at December 31, 2017.

(7) Taxes:

As of March 31, 2018, the Company's calendar years 2016, 2015 and 2014 remain subject to examination by the Internal Revenue Service.

The effective federal tax rate on consolidated income for the three months ended March 31, 2018 was (5.1%) compared to 33.6% for the three months ended March 31, 2017. The effective federal income tax rate differs from the normal statutory rate primarily as a result of tax-exempt investment income. The effective tax rate for the three months ended March 31, 2018 was also impacted by the change in accounting for unrealized gains and losses on equity securities related to the adoption of ASU 2016-01 where changes in unrealized, and the corresponding tax effects, are now recorded in the condensed consolidated statement of income. The Company recorded an unrealized loss, and corresponding tax benefit, related to equity securities during the three months ended March 31, 2018. Additionally, the decrease also reflects the reduced federal corporate income tax rate as a result of the enactment of the U.S. Tax Act in December 2017. The Company continues to analyze the different aspects of the U.S. Tax Act, which could potentially affect the provisional estimates that were recorded at December 31, 2017.