Subsequent Events (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 Revolving Credit Agreement [Member]	Jul. 10, 2012 Revolving Credit Agreement [Member] Financing [Member]	Jul. 16, 2012 Synventive [Member] Acquisition [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Accordian Feature Amount		$ 250,000
Line of credit facility, maximum borrowing capacity	500,000	750,000
Business Acquisition, Cost of Acquired Entity, Purchase Price			$ 335,000