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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 No definition available. + 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 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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