Acquisitions	6 Months Ended
Jun. 30, 2011
Acquisitions [Abstract]
Acquisitions	9. Acquisitions On July 28, 2011, a wholly-owned subsidiary of the Company acquired Zokem Oy, a Finland-based mobile audience measurement and analytics firm. The Company paid approximately $11.7 million in cash for the acquisition with possible additional cash payments to be made through 2015 of up to $12.0 million, which is contingent upon Zokem reaching certain financial performance targets in the future. On June 15, 2010, a wholly-owned subsidiary of the Company, purchased the technology portfolio, trade name, and equipment of Integrated Media Measurement, Inc. The Company paid $2.5 million for these assets, which included $1.8 million of intangible assets, $0.3 million of computer equipment, and $0.4 million of goodwill. The intangible assets are being amortized over 5.0 years. On March 23, 2010, the Company entered into a licensing arrangement with Digimarc Corporation (“Digimarc”) to receive a non-exclusive, worldwide and irrevocable license to a substantial portion of Digimarc’s domestic and international patent portfolio. The Company paid $4.5 million for this other intangible asset, which is being amortized over 7.0 years.

Acquisitions

6 Months Ended

Jun. 30, 2011

9. Acquisitions

On July 28, 2011, a wholly-owned subsidiary of the Company acquired Zokem Oy, a Finland-based mobile audience measurement and analytics firm. The Company paid approximately $11.7 million in cash for the acquisition with possible additional cash payments to be made through 2015 of up to $12.0 million, which is contingent upon Zokem reaching certain financial performance targets in the future.

On June 15, 2010, a wholly-owned subsidiary of the Company, purchased the technology portfolio, trade name, and equipment of Integrated Media Measurement, Inc. The Company paid $2.5 million for these assets, which included $1.8 million of intangible assets, $0.3 million of computer equipment, and $0.4 million of goodwill. The intangible assets are being amortized over 5.0 years.

On March 23, 2010, the Company entered into a licensing arrangement with Digimarc Corporation (“Digimarc”) to receive a non-exclusive, worldwide and irrevocable license to a substantial portion of Digimarc’s domestic and international patent portfolio. The Company paid $4.5 million for this other intangible asset, which is being amortized over 7.0 years.