pre_text: on either a straight-line or accelerated basis . amortization expense for intangibles was approximately $ 4.2 million , $ 4.1 million and $ 4.1 million during the years ended december 31 , 2010 , 2009 and 2008 , respectively . estimated annual amortization expense of the december 31 , 2010 balance for the years ended december 31 , 2011 through 2015 is approximately $ 4.8 million . impairment of long-lived assets long-lived assets are reviewed for possible impairment whenever events or circumstances indicate that the carrying amount of such assets may not be recoverable . if such review indicates that the carrying amount of long- lived assets is not recoverable , the carrying amount of such assets is reduced to fair value . during the year ended december 31 , 2010 , we recognized impairment charges on certain long-lived assets during the normal course of business of $ 1.3 million . there were no adjustments to the carrying value of long-lived assets of continuing operations during the years ended december 31 , 2009 or 2008 . fair value of financial instruments our debt is reflected on the balance sheet at cost . based on market conditions as of december 31 , 2010 , the fair value of our term loans ( see note 5 , 201clong-term obligations 201d ) reasonably approximated the carrying value of $ 590 million . at december 31 , 2009 , the fair value of our term loans at $ 570 million was below the carrying value of $ 596 million because our interest rate margins were below the rate available in the market . we estimated the fair value of our term loans by calculating the upfront cash payment a market participant would require to assume our obligations . the upfront cash payment , excluding any issuance costs , is the amount that a market participant would be able to lend at december 31 , 2010 and 2009 to an entity with a credit rating similar to ours and achieve sufficient cash inflows to cover the scheduled cash outflows under our term loans . the carrying amounts of our cash and equivalents , net trade receivables and accounts payable approximate fair value . we apply the market and income approaches to value our financial assets and liabilities , which include the cash surrender value of life insurance , deferred compensation liabilities and interest rate swaps . required fair value disclosures are included in note 7 , 201cfair value measurements . 201d product warranties some of our salvage mechanical products are sold with a standard six-month warranty against defects . additionally , some of our remanufactured engines are sold with a standard three-year warranty against defects . we record the estimated warranty costs at the time of sale using historical warranty claim information to project future warranty claims activity and related expenses . the changes in the warranty reserve are as follows ( in thousands ) : .
post_text: self-insurance reserves we self-insure a portion of employee medical benefits under the terms of our employee health insurance program . we purchase certain stop-loss insurance to limit our liability exposure . we also self-insure a portion of .
table: Balance as of January 1, 2009 $540
table: Warranty expense 5,033
table: Warranty claims (4,969)
table: Balance as of December 31, 2009 604
table: Warranty expense 9,351
table: Warranty claims (8,882)
table: Business acquisitions 990
table: Balance as of December 31, 2010 $2,063
question: Analyse this data from a financial earnings document. what was the percentage change in warranty reserve between 2009 and 2010?