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Goodwill and Intangible Assets (Tables)

12 Months Ended

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