2.2.0.25falsefalse0211 - Disclosure - Credit Facilitytruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $Jan-01-2011_Mar-31-2011http://www.sec.gov/CIK0000793547duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0navg_CreditFacilityAbstractnavgfalsenadurationCredit Facility Abstract.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCredit Facility Abstract.falsefalseCredit Facility [Abstract]3false0navg_CreditFacilityTextBlocknavgfalsenadurationCredit Facility Text Block.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00  <div style="font-family: 'Times New Roman',Times,serif; margin-left: 0in; "> <div align="justify" style="font-size: 10pt; margin-top: 10pt"><b>Note 11. Credit Facility</b> </div> <div align="justify" style="font-size: 10pt; margin-top: 10pt">On April 1, 2011, we entered into a $165 million credit facility agreement with ING Bank, N.V., London Branch, individually and as Administrative Agent, and a syndicate of lenders. The credit facility is a letter of credit facility and replaces a $140 million credit facility agreement that expired March 31, 2011. The credit facility, which is denominated in U.S. dollars, will be utilized to fund the Company’s participation in Syndicate 1221 through letters of credit for the 2011 and 2012 underwriting years, as well as open prior years. The letters of credit issued under the facility are denominated in British pounds and their aggregate face amount will fluctuate based on exchange rates. The ability to have letters of credit issued under this credit facility expires on December 31, 2011. At March 31, 2011, letters of credit with an aggregate face amount of $132 million were outstanding under the credit facility. </div> <div align="justify" style="font-size: 10pt; margin-top: 10pt">This credit facility contains customary covenants for facilities of this type, including restrictions on indebtedness and liens, limitations on mergers, dividends and the sale of assets, and requirements as to maintaining certain consolidated tangible net worth, statutory surplus and other financial ratios. The credit facility also provides for customary events of default, including failure to pay principal, interest or fees when due, failure to comply with covenants, any representation or warranty made by the Company being false in any material respect, default under certain other indebtedness, certain insolvency or receivership events affecting the Company and its subsidiaries, the occurrence of certain material judgments, or a change in control of the Company. The letter of credit facility is secured by a pledge of the stock of certain insurance subsidiaries of the Company. To the extent the aggregate face amount issued under the credit facility exceeds the commitment amount, the Company is required to post collateral with the lead bank of the consortium. The Company was in compliance with all covenants under the credit facility at March 31, 2011. </div> <div align="justify" style="font-size: 10pt; margin-top: 10pt">As a result of the April 1, 2011 renewal of the credit facility, the applicable margin and applicable fee rate payable under the letter of credit facility are now based on a tiered schedule that is based on the Company’s then-current ratings issued by S&P and Moody’s Investors Service (“Moody’s”) with respect to the Company’s senior unsecured long-term debt securities and without third-party credit enhancement and the amount of the Company’s own ‘Funds at Lloyd’s’ collateral. </div>   </div>  <div style="font-family: 'Times New Roman',Times,serif; margin-left: 0in; "> </div>  <!-- Begin Block Tagged NotefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringCredit Facility Text Block.No authoritative reference available.falsefalseCredit Facility12Credit FacilityUnKnownUnKnownUnKnownUnKnownfalsetrue