AECON GROUP INC 49 14 CONCESSION RIGHTS AND OTHER INTANGIBLE ASSETS Licenses Acquired software Concession customer and other rights Goodwill backlog rights Total Cost Balance as at January 1 2012 362643 53783 25631 16505 458562 Additions Acquired separately 51178 2167 53345 Interest capitalized 14992 14992 Disposals 490 490 Foreign currency translation adjustments and other changes 8885 3 8882 Balance as at December 31 2012 419928 53783 25631 18185 517527 Accumulated amortization and impairment Balance as at January 1 2012 55391 24273 7857 87521 Amortization 2874 1358 3250 7482 Disposals 490 490 Foreign currency translation adjustments and other changes 2389 5 2384 Balance as at December 31 2012 55876 25631 10622 92129 Net book value as at December 31 2012 364052 53783 7563 425398 Net book value as at January 1 2012 307252 53783 1358 8648 371041 Licenses Acquired software Concession customer and other rights Goodwill backlog rights Total Cost Balance as at January 1 2011 270960 53783 25631 15915 366289 Additions Acquired separately 69613 2304 71917 Interest capitalized 13700 13700 Disposals 1668 1668 Foreign currency translation adjustments and other changes 8370 46 8324 Balance as at December 31 2011 362643 53783 25631 16505 458562 Accumulated amortization and impairment Balance as at January 1 2011 50743 17353 6347 74443 Amortization 3402 6920 2767 13089 Disposals 1197 1197 Foreign currency translation adjustments and other changes 1246 60 1186 Balance as at December 31 2011 55391 24273 7857 87521 Net book value as at December 31 2011 307252 53783 1358 8648 371041 Net book value as at January 1 2011 220217 53783 8278 9568 291846