Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2018
Accounting Policies [Abstract]
Fair Value Assumptions	Fair value assumptions The carrying amounts for the following financial instrument categories approximate their fair values at March 31, 2018 and December 31, 2017, because of their short-term nature: cash and cash equivalents, accrued investment income, premiums receivable, reinsurance recoverable, reinsurance payable, other assets, and other liabilities. The carrying amount of the notes payable to the Florida State Board of Administration, the Branch Banking & Trust Corporation (BB&T) and our senior notes approximate fair value as the interest rates and terms are variable.
Pending Accounting Pronouncements	Pending Accounting Pronouncements We have evaluated recent accounting pronouncements that have had or may have a significant effect on our financial statements or on our disclosures. In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (ASU 2017-04). This update simplifies the manner in which an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. ASU 2017-07 is effective for annual periods beginning after December 15, 2019, including interim periods within those annual periods, with early adoption permitted for certain requirements. We do not intend to early adopt and are assessing the impact of adopting this new accounting standard on our consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). This update is intended to replace existing lease guidance by requiring a lessee to recognize substantially all leases (whether operating or finance leases) on the balance sheet as a right-of-use asset and an associated lease liability. Short-term leases of 12 months or less are excluded from this amendment. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. We do not intend to early adopt and are assessing the impact of adopting this new accounting standard on our consolidated financial statements and related disclosures.
Income Taxes	Income Taxes As of March 31, 2018, we have not fully completed our accounting for the tax effects of the enactment of the legislation commonly known as the Tax Cuts and Jobs Act of 2017 with regard to the deductibility of compensation expense for certain covered executives due to uncertainty surrounding the appropriate tax treatment of outstanding performance-based awards, and uncertainty surrounding the discount factors to be applied for loss reserve discounting. We are waiting for the Internal Revenue Service to publish additional guidance or information for both items.
Compensation Related Costs	In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718)-Scope of Modification Accounting (ASU 2017-09). This standard provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. ASU 2017-09 is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods, with early adoption permitted for certain requirements. We did not early adopt and the new guidance did not impact the way in which we account for share-based payment transactions. Therefore, the adoption as of January 1, 2018 had no impact on our results of operations.
Revenue Recognition	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09). Insurance contracts are excluded from the scope of this standard. This standard provides guidance on revenue recognition for entities that enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets. The transaction price is attributed to underlying performance obligations in the contract and revenue is recognized as the entity satisfies the performance obligation and transfers control of the good or service to the customer. We adopted this standard on January 1, 2018. We note that the standard is not applicable to our insurance contracts or other revenue streams, and therefore the adoption of this new accounting standard did not have a material impact on our consolidated financial statements and related disclosures.
Investment ASU 2016-01	In January 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01). This update substantially revises standards for the recognition, measurement and presentation of financial instruments. This standard revised our accounting related to (1) the classification and measurement of investments in equity securities and (2) the presentation of certain fair value changes for financial liabilities measured at fair value. It also amended certain disclosure requirements associated with the fair value of financial instruments. ASU 2016-01 is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods, with early adoption permitted for certain requirements. We adopted this standard as of January 1, 2018, which resulted in a reclassification of a $9,338,000 gain, net of tax, on equity securities from accumulated other comprehensive income to retained earnings on our consolidated financial statements. Refer to Note 14 for a reconciliation. Additionally, as a result of the adoption of ASU 2016-01, we also recognized a $2,444,000 loss based on the change in fair value of equity securities in the Unaudited Consolidated Statements of Income for the three months ended March 31, 2018.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

- Definition

Disclosure of accounting policy for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the disclosure may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment.

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