Taxes	3 Months Ended
Mar. 31, 2019
Taxes [Abstract]
Taxes	(7) Taxes: The effective federal tax rate on consolidated income for the three months ended March 31, 2019 was 21.8% compared to (5.1%) for the three months ended March 31, 2018. The effective federal income tax rate differs from the normal statutory rate in part 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 Company's adoption of ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, where changes in unrealized gains and losses, and the corresponding tax effects, are now recorded in the condensed consolidated statement of operations. The Company recorded an unrealized loss, and corresponding tax benefit, related to equity securities during the three months ended March 31, 2019. As of March 31, 2019, the Company's calendar years 2017, 2016 and 2015 remain subject to examination by the Internal Revenue Service.

Taxes

3 Months Ended

Mar. 31, 2019

(7) Taxes:

The effective federal tax rate on consolidated income for the three months ended March 31, 2019 was 21.8% compared to (5.1%) for the three months ended March 31, 2018. The effective federal income tax rate differs from the normal statutory rate in part 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 Company's adoption of ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, where changes in unrealized gains and losses, and the corresponding tax effects, are now recorded in the condensed consolidated statement of operations. The Company recorded an unrealized loss, and corresponding tax benefit, related to equity securities during the three months ended March 31, 2019.

As of March 31, 2019, the Company's calendar years 2017, 2016 and 2015 remain subject to examination by the Internal Revenue Service.