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Goodwill and Intangible Assets (Changes in the Carrying Amount of Goodwill, by Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]
Balance at December 31	$ 1,733,722	$ 1,352,281
Goodwill acquired during the year	82,599	402,575
Earn-out and milestone payments	(36)	1,122
Purchase adjustments	(70,034)	615
Effect of foreign currency translation	13,647	(22,871)
Balance at December 31	$ 1,759,898	$ 1,733,722

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Goodwill Earn Out And Milestone Payments

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

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