v2.4.0.6

Goodwill and intangible assets (Details 2) (USD $) In Thousands, unless otherwise specified |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Venue contracts | Dec. 31, 2011 Venue contracts | Dec. 31, 2012 Technology | Dec. 31, 2012 Advertiser relationships | Dec. 31, 2012 Patents, trademarks and other | Dec. 31, 2011 Patents, trademarks and other
Intangible assets |  |  |  |  |  |  |  |  |
Weighted Average Amortization |  |  |  | 11 years | 11 years | 5 years | 5 years | 5 years | 6 years
Historical Cost | $ 28,905 | $ 26,776 |  | $ 26,886 | $ 26,385 | $ 1,110 | $ 70 | $ 839 | $ 391
Accumulated Amortization | (18,311) | (16,930) |  | (17,783) | (16,874) | (93) | (6) | (429) | (56)
Net Book Value | 10,594 | 9,846 | 11,251 | 9,103 | 9,511 | 1,017 | 64 | 410 | 335
Amortization expense for fiscal years 2013 through 2016 and thereafter |  |  |  |  |  |  |  |  |
2013 | 1,220 |  |  |  |  |  |  |  |
2014 | 1,175 |  |  |  |  |  |  |  |
2015 | 1,127 |  |  |  |  |  |  |  |
2016 | 1,092 |  |  |  |  |  |  |  |
2017 | 970 |  |  |  |  |  |  |  |
Thereafter | 5,010 |  |  |  |  |  |  |  |
Net Book Value | $ 10,594 | $ 9,846 | $ 11,251 | $ 9,103 | $ 9,511 | $ 1,017 | $ 64 | $ 410 | $ 335

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