Acquisitions (Summary Of The Allocation Of The Purchase Price Of Acquisitions) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Business Acquisition [Line Items]
Net tangible assets acquired	$ 8,099
Amortizable intangible assets	24,137
Deferred tax liability	(7,899)
Goodwill	17,987
Total	42,324
AWR Corporation [Member]
Business Acquisition [Line Items]
Net tangible assets acquired	10,718
Amortizable intangible assets	31,685
Deferred tax liability	(8,387)
Goodwill	32,379
Total	66,395
Phase Matrix Inc [Member]
Business Acquisition [Line Items]
Net tangible assets acquired	5,624
Amortizable intangible assets	8,331
Goodwill	26,725
Total	40,680
Privately-Held Companies [Member]
Business Acquisition [Line Items]
Total	$ 42,000