Organization and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Basis of Presentation	Basis of Presentation The accompanying interim consolidated financial statements are unaudited and reflect all adjustments which, in the opinion of management, are necessary to fairly present the results of The Navigators Group, Inc. and its subsidiaries for the interim periods presented on the basis of United States generally accepted accounting principles (“GAAP” or “U.S. GAAP”). All significant intercompany transactions and balances have been eliminated in consolidation. The preparation of these financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported revenues and expenses during the reporting periods. The results of operations for any interim period are not necessarily indicative of results for the full year. The interim consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2014. Certain amounts for the prior year have been reclassified to conform with the current period presentation. Unless the context requires otherwise, the terms “we,” “us,” “our,” or “our Company” are used to mean The Navigators Group, Inc., a Delaware holding company established in 1982, and its subsidiaries. The terms “Parent” or “Parent Company” are used to mean The Navigators Group, Inc. without its subsidiaries.
Organization	Organization We are an international insurance company with a long-standing area of specialization in Marine insurance. Our Property and Casualty (“P&C”) insurance business primarily offers General Liability coverage and Umbrella & Excess Liability coverage to commercial enterprises through our Primary and Excess Casualty divisions. We have also developed niches in Professional Liability insurance, through our Management Liability and Errors and Omissions divisions. Beginning in 2010, we added reinsurance products through our Assumed Reinsurance division. We operate through various wholly-owned subsidiaries, including Navigators Insurance Company, inclusive of its United Kingdom Branch (“U.K. Branch”), and Navigators Specialty Insurance Company, both of which are U.S. insurance companies, and Navigators Underwriting Agency Ltd., a Lloyd’s of London (“Lloyd’s”) underwriting agency that manages Lloyd’s Syndicate 1221 (“the Syndicate”) in the U.K. The Company controls 100% of the Syndicate’s stamp capacity.
Foreign Exchange Remeasurement and Translation	Foreign Exchange Remeasurement and Translation During the first quarter of 2014, the Syndicate revised its foreign exchange accounting methodology from reporting its financial position and results using three functional currencies (GBP, USD and CAD) to one functional currency (USD). The USD was chosen as the single functional currency as the majority of the Syndicate’s insurance business has been and continues to be transacted in USD. This cumulative change in remeasurement has resulted in an immaterial correction of $10.0 million ($6.6 million after-tax) in Accumulated other comprehensive income (“AOCI”), on the Consolidated Balance Sheets, offset by a gain in Other income in the Consolidated Statements of Income.
Catastrophe Risk Management	Catastrophe Risk Management We have exposure to losses caused by hurricanes, earthquakes, and other natural and man-made catastrophic events. The frequency and severity of catastrophic events is unpredictable. The extent of covered losses from a catastrophe is a function of both the total amount of insured exposure in an area affected by the event and the severity of the event. We had no material catastrophic events occur in the first quarter 2015.
Income Taxes	Income Taxes The income tax provision has been computed based on our estimated annual effective tax rate. Our effective tax rate for the quarter differs from the federal tax rate of 35% principally because of tax-exempt investment income and dividends received deduction.
Current and Pending Accounting Pronouncements	Current and Pending Accounting Pronouncements As of January 1, 2015, we did not adopt any new accounting pronouncements. In April 2015, the Financial Accounting Standards Board issued a new pronouncement, Accounting Standards Update 2015-03 – Interest – Imputation of Interest (Subtopic 835-30) – Simplifying the Presentation of Debt Issuance Costs, which will be effective for fiscal years beginning after December 15, 2015. The new pronouncement was issued to simplify presentation of debt issuance costs. We are assessing the future impact of this update to our Consolidated Financial Statements. There were no additional pending accounting pronouncements that are expected to have a significant impact on the consolidated financial statements upon adoption.

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.

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