Acquisition (Details) (Cytometers [Member], USD $) In Thousands	Jun. 30, 2011	Mar. 18, 2011
Cytometers [Member]
Fair values of the assets acquired and liabilities assumed
Developed technology	$ 111,500
Acquired in-process research and development	42,300
Other intangibles	2,850
Deferred tax assets	10,442
Other	8,176
Total identifiable assets acquired	175,268
Deferred tax liabilities	(59,869)
Other	(4,728)
Total liabilities assumed	(64,597)
Net identifiable assets acquired	110,671
Goodwill	94,299
Net assets acquired	$ 204,970	$ 204,970