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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Goodwill and Other Intangible Assets [Abstract] |
Summary of the goodwill by segment and the changes in the carrying amount of goodwill |
|  | BT |  |  | TI |  |  | M&S |  |  | Events |  |  | Total |
Balance, December 31, 2010 |  | $ | 22,208 |  |  | $ | 24,653 |  |  | $ | 19,191 |  |  | $ | 1,906 |  |  | $ | 67,958 |
Acquisition |  |  | — |  |  |  | 3,695 |  |  |  | — |  |  |  | — |  |  |  | 3,695 |
Translation adjustments |  |  | (36 | ) |  |  | (40 | ) |  |  | (31 | ) |  |  | (3 | ) |  |  | (110 | )
Balance, December 31, 2011 |  |  | 22,172 |  |  |  | 28,308 |  |  |  | 19,160 |  |  |  | 1,903 |  |  |  | 71,543 |
Reassignment |  |  | 17,237 |  |  |  | (28,308 | ) |  |  | 11,071 |  |  |  | — |  |  |  | — |
Translation adjustments |  |  | 4,082 |  |  |  | — |  |  |  | 3,131 |  |  |  | 198 |  |  |  | 7,411 |
Balance, December 31, 2012 |  | $ | 43,491 |  |  | $ | — |  |  | $ | 33,362 |  |  | $ | 2,101 |  |  | $ | 78,954 |
Summary of intangible assets |
|  | December 31, 2012 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 33,759 |  |  | $ | 26,644 |  |  | $ | 7,115 |
Research content |  |  | 7,043 |  |  |  | 7,043 |  |  |  | — |
Technology |  |  | 1,507 |  |  |  | 702 |  |  |  | 805 |
Trademarks |  |  | 876 |  |  |  | 876 |  |  |  | — |
Total |  | $ | 43,185 |  |  | $ | 35,265 |  |  | $ | 7,920 |
|  | December 31, 2011 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 33,379 |  |  | $ | 24,925 |  |  | $ | 8,454 |
Research content |  |  | 6,929 |  |  |  | 6,209 |  |  |  | 720 |
Technology |  |  | 1,507 |  |  |  | 442 |  |  |  | 1,065 |
Trademarks |  |  | 876 |  |  |  | 876 |  |  |  | — |
Other |  |  | 328 |  |  |  | 250 |  |  |  | 78 |
Total |  | $ | 43,019 |  |  | $ | 32,702 |  |  | $ | 10,317 |
Estimated amortization expense related to intangible assets |
Year ending December 31, 2013 |  | $ | 2,228 |
Year ending December 31, 2014 |  |  | 2,133 |
Year ending December 31, 2015 |  |  | 1,002 |
Year ending December 31, 2016 |  |  | 906 |
Year ending December 31, 2017 |  |  | 857 |
Thereafter |  |  | 794 |
Total |  | $ | 7,920 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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