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Amortizable Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2012	Feb. 03, 2012 Unity	Mar. 31, 2012 Other business acquisitions
Identified intangible assets assumed in the acquisition
Total		$ 19,280	$ 3,700
Consideration amount due in the future	1,050		1,000
Estimated future amortization expense of intangible assets
2012 (remaining 9 months)	27,545
2013	34,835
2014	30,694
2015	30,044
2016	29,089
Thereafter	42,688
Total	$ 194,895

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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The aggregate estimated amortization expense for succeeding fiscal years for intangible assets subject to amortization.

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