Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Disclosures [Abstract]

Schedule of Fair Value Hierarchy for Financial Assets and Liabilities

The following table presents our fair value hierarchy for our financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2011 and 2010:

	As of December 31, 2011								As of December 31, 2010
(in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Short-term investments	$	9,290	$	45,287	$	—	$	54,577	$	70,000	$	36,077	$	—	$	106,077
Foreign exchange contracts	—		6,147		—		6,147		—		677		—		677
	$	9,290	$	51,434	$	—	$	60,724	$	70,000	$	36,754	$	—	$	106,754
Liabilities:
Foreign exchange contracts	$	—	$	2,492	$	—	$	2,492	$	—	$	13,565	$	—	$	13,565
Interest rate contracts	—		—		—		—		—		2,663		—		2,663
Contingent Consideration	—		—		38,646		38,646		—		—		22,510		22,510
	$	—	$	2,492	$	38,646	$	41,138	$	—	$	16,228	$	22,510	$	38,738

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

For liabilities with Level 3 inputs, the following table summarizes the activity as of December 31, 2011:

(in thousands) (unaudited)	Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Contingent Consideration
Beginning Balance at December 31, 2010	$	22,510
Additions from acquisitions	24,885
Payments	(9,065		)
Total loss included in earnings	253
Foreign currency translation	63
Ending balance at December 31, 2011	$	38,646