Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of financial assets that are required to be measured at fair value

			Fair Value Measurements at Reporting Date
	Amount Recorded on Balance Sheet		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)
Assets as of March 31, 2013:
Cash and cash equivalents	$	141,527	$	141,527	—	—
Short-term investments	$	3,179	$	3,179	—	—
Liabilities as of March 31, 2013:
Contingent consideration	$	—	—		—	$	24,625

Assets as of December 31, 2012:
Cash and cash equivalents	$	157,551	$	157,551	—	—
Short-term investments	$	3,441	$	3,441	—	—
Liabilities as of December 31, 2012:
Contingent consideration	$	—	—		—	$	23,431

Schedule of the Company's contingent consideration liability level three fair value measurements rollforward

	Significant Unobservable Inputs (Level 3)
Contingent Consideration
Balance at December 31, 2012	$	23,431
Additions:
FSSI acquisition on March 11, 2013	838
Change in fair value of contingent consideration	356
Balance at March 31, 2013	$	24,625

- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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