fiscal 2004 acquisitions in february 2004 , the company completed the acquisition of all the outstanding shares of accelerant networks , inc . ( accelerant ) for total consideration of $ 23.8 million , and the acquisition of the technology assets of analog design automation , inc . ( ada ) for total consideration of $ 12.2 million . the company acquired accelerant in order to enhance the company 2019s standards-based ip solutions . the company acquired the assets of ada in order to enhance the company 2019s analog and mixed signal offerings . in october 2004 , the company completed the acquisition of cascade semiconductor solutions , inc . ( cascade ) for total upfront consideration of $ 15.8 million and contingent consideration of up to $ 10.0 million to be paid upon the achievement of certain performance milestones over the three years following the acquisition . contingent consideration totaling $ 2.1 million was paid during the fourth quarter of fiscal 2005 and has been allocated to goodwill . the company acquired cascade , an ip provider , in order to augment synopsys 2019 offerings of pci express products . included in the total consideration for the accelerant and cascade acquisitions are aggregate acquisition costs of $ 4.3 million , consisting primarily of legal and accounting fees and other directly related charges . as of october 31 , 2006 the company has paid substantially all the costs related to these acquisitions . in fiscal 2004 , the company completed one additional acquisition and two additional asset acquisition transactions for aggregate consideration of $ 12.3 million in upfront payments and acquisition-related costs . in process research and development expenses associated with these acquisitions totaled $ 1.6 million for fiscal 2004 . these acquisitions are not considered material , individually or in the aggregate , to the company 2019s consolidated balance sheet and results of operations . as of october 31 , 2006 , the company has paid substantially all the costs related to these acquisitions . the company allocated the total aggregate purchase consideration for these transactions to the assets and liabilities acquired , including identifiable intangible assets , based on their respective fair values at the acquisition dates , resulting in aggregate goodwill of $ 24.5 million . aggregate identifiable intangible assets as a result of these acquisitions , consisting primarily of purchased technology and other intangibles , are $ 44.8 million , and are being amortized over three to five years . the company includes the amortization of purchased technology in cost of revenue in its statements of operations . note 4 . goodwill and intangible assets goodwill consists of the following: .
what is the variation observed in the balance between 2005 and 2006 , in thousands?
( 1 ) during fiscal year 2005 , additions represent goodwill acquired in acquisitions of ise and nassda of $ 72.9 million and $ 92.4 million , respectively , and contingent consideration earned and paid of $ 1.7 million and $ 2.1 million related to an immaterial acquisition and the acquisition of cascade , respectively . ( 2 ) during fiscal year 2005 , synopsys reduced goodwill primarily related to tax reserves for avant! no longer probable due to expiration of the federal statute of limitations for claims. .