Acquisitions (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended		6 Months Ended			6 Months Ended		6 Months Ended
	Jul. 31, 2012 AWR Corporation [Member]	Mar. 31, 2012 AWR Corporation [Member]	Jun. 30, 2012 AWR Corporation [Member]	Jun. 30, 2011 AWR Corporation [Member]	Jun. 30, 2012 Phase Matrix Inc. [Member]	May 20, 2011 Phase Matrix Inc. [Member]	Jun. 30, 2012 Minimum [Member] AWR Corporation [Member]	Jun. 30, 2012 Minimum [Member] Phase Matrix Inc. [Member]	Jun. 30, 2012 Maximum [Member] AWR Corporation [Member]	Jun. 30, 2012 Maximum [Member] Phase Matrix Inc. [Member]
Business Acquisition [Line Items]
Date of acquisition		Jun. 30, 2011			May 20, 2011
Acquisition purchase price				$ 66,395,000		$ 40,680,000
Cash paid for acquired company				54,000,000		38,900,000
Common stock paid for acquired company						1,800,000
Term of earn-out arrangement (in number of years)				3 years
Potential undiscounted payments under the earn-out arrangement							0		29,000,000
Estimated fair value of the earn-out arrangement				12,000,000
Contingent consideration, payments	3,300,000
Decrease in goodwill			$ 1,600,000
Useful life (in years)			5 years					9 months		8 years