Acquisitions (Acquisition Date Fair Value Of The Consideration) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Estimated fair value of contingent consideration obligation	$ 8,000	$ 0
Simena [Member]
Business Acquisition [Line Items]
Initial cash payment	10,086
Estimated fair value of contingent consideration obligation	8,000
Total consideration	$ 18,086