Acquisitions (Summary Of The Allocation Of The Purchase Price Of Acquisitions) (Details) (USD $)	Dec. 31, 2011
AWR Corporation [Member]
Business Acquisition [Line Items]
Net tangible assets acquired	$ 10,718,000
Amortizable intangible assets	31,685,000
Deferred tax liability	(10,011,000)
Goodwill	34,003,000
Total	66,395,000
Phase Matrix Inc [Member]
Business Acquisition [Line Items]
Net tangible assets acquired	5,624,000
Amortizable intangible assets	8,331,000
Goodwill	26,725,000
Total	$ 40,680,000