Acquisitions (Narrative) (Details) (USD $)						12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011	Jan. 10, 2011	Jan. 10, 2011 Maximum [Member]	Jan. 10, 2011 Minimum [Member]	Dec. 31, 2011 Purchased Technology [Member]	Dec. 31, 2011 Trade Names [Member]
Business Acquisition [Line Items]
Outstanding equity acquired, percentage			100.00%
Payment to the former security holders		$ 6,000,000	$ 24,900,000
Additional agreed contingent payments upon the achievement of certain regulatory and sales targets				30,000,000	15,000,000
Minimum additional consideration payable in three separate installments			15,000,000
Remaining contingent payment upon achievement of specified sales targets within specified years after closing			15,000,000
Fair value of the consideration at the date of acquisition	9,676,000		40,300,000
Estimated fair value of the consideration to be paid to former security holders			15,400,000
Estimated fair value intangible assets acquired						$ 26,800,000	$ 2,800,000
Useful life of intangible assets acquired, years						15	10