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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | As of December 31, the gross and net amounts of acquired intangible assets were as follows:
Goodwill |  | Strategic Marketing Services |  | Performance Marketing Services |  | Total |
Balance as of December 31, 2010 |  | $ | 326,977 |  | $ | 187,511 |  | $ | 514,488 |
Acquired goodwill |  |  | 61,944 |  |  | 23,763 |  |  | 85,707 |
Acquisition purchase price adjustments |  |  | 1,458 |  |  | 5,549 |  |  | 7,007 |
Foreign currency translation |  |  | (854) |  |  | (1,104) |  |  | (1,958) |
Balance as of December 31, 2011 |  | $ | 389,525 |  | $ | 215,719 |  | $ | 605,244 |
Acquired goodwill |  |  | 93,531 |  |  | 19,873 |  |  | 113,404 |
Acquisition purchase price adjustments |  |  | (78) |  |  | (223) |  |  | (301) |
Foreign currency translation |  |  | 782 |  |  | 942 |  |  | 1,724 |
Balance as of December 31, 2012 |  | $ | 483,760 |  | $ | 236,311 |  | $ | 720,071 |
Schedule Of Intangible Assets Excluding Goodwill [Table Text Block] |
|  | For the Year Ended December 31, |
|  | 2012 |  | 2011 |
Intangibles: |  |  |  |  |  |  |
Trademarks (indefinite life) |  | $ | 17,780 |  | $ | 17,780 |
Customer relationships – gross |  | $ | 104,070 |  | $ | 79,154 |
Less accumulated amortization |  |  | (66,108) |  |  | (44,803) |
Customer relationships – net |  | $ | 37,962 |  | $ | 34,351 |
Other intangibles – gross |  | $ | 20,908 |  | $ | 16,202 |
Less accumulated amortization |  |  | (13,407) |  |  | (10,353) |
Other intangibles – net |  | $ | 7,501 |  | $ | 5,849 |
Total intangible assets |  | $ | 142,758 |  | $ | 113,136 |
Less accumulated amortization |  |  | (79,515) |  |  | (55,156) |
Total intangible assets – net |  | $ | 63,243 |  | $ | 57,980 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | the estimated amortization expense for the five succeeding years is:
Year |  | Amortization |
2013 |  | $ | 18,363 |
2014 |  | $ | 12,851 |
2015 |  | $ | 7,026 |
2016 |  | $ | 3,662 |
2017 |  | $ | 1,239 |

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- Definition Tabular disclosure of both indefinite and finite lived intangible assets excluding goodwill. + References No definition available. + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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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 Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: 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 + Details
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