federal realty investment trust schedule iii summary of real estate and accumulated depreciation 2014continued three years ended december 31 , 2006 reconciliation of accumulated depreciation and amortization ( in thousands ) .
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Balance, December 31, 2003 $514,177
Additions during period—depreciation and amortization expense 82,551
Deductions during period—disposition and retirements of property (1,390)
Balance, December 31, 2004 595,338
Additions during period—depreciation and amortization expense 83,656
Deductions during period—disposition and retirements of property (15,244)
Balance, December 31, 2005 663,750
Additions during period—depreciation and amortization expense 89,564
Deductions during period—disposition and retirements of property (12,807)
Balance, December 31, 2006 $740,507
balance december 31 2003 $ 514177
additions during period 2014depreciation and amortization expense 82551
deductions during period 2014disposition and retirements of property -1390 ( 1390 )
balance december 31 2004 595338
additions during period 2014depreciation and amortization expense 83656
deductions during period 2014disposition and retirements of property -15244 ( 15244 )
balance december 31 2005 663750
additions during period 2014depreciation and amortization expense 89564
deductions during period 2014disposition and retirements of property -12807 ( 12807 )
balance december 31 2006 $ 740507