Acquisitions (Narrative) (Details) (USD $)	12 Months Ended	1 Months Ended	6 Months Ended	12 Months Ended		12 Months Ended			12 Months Ended
	Dec. 31, 2012	Jul. 31, 2012 AWR Corporation [Member]	Jun. 30, 2012 AWR Corporation [Member]	Dec. 31, 2012 AWR Corporation [Member]	Jun. 30, 2011 AWR Corporation [Member]	Dec. 31, 2012 Phase Matrix Inc [Member]	May 31, 2011 Phase Matrix Inc [Member]	Dec. 31, 2012 Privately-Held Companies [Member]	Dec. 31, 2012 Maximum [Member] Phase Matrix Inc [Member]	Dec. 31, 2012 Minimum [Member]
Business Acquisition [Line Items]
Date of acquisition				Jun. 30, 2011		May 20, 2011
Acquisition purchase price	$ 42,324,000			$ 66,395,000		$ 40,680,000		$ 42,000,000
Cash paid for acquired company					54,000,000		38,900,000	25,000,000
Cash received for acquired entity								5,000,000
Future cash payments								12,000,000
Common stock paid for acquired company							1,800,000
Term of earn-out arrangement (in number of years)					3 months
Potential undiscounted payments under the earn-out arrangement, range minimum					0
Potential undiscounted payments under the earn-out arrangement, range maximum					29,000,000
Estimated fair value of the earn-out arrangement					12,000,000
Useful life (in years)	5 years								8 years	9 months
Contingent consideration, payments		3,300,000
General And Administrative Expense AWR Accrual Adjustment	6,783,000
Decrease in goodwill			1,600,000
Shares of common stock paid for acquired company							1,800,000
Net tangible assets acquired	8,099,000			10,718,000		5,624,000
Purchase price allocation, amortizable intangible assets	24,137,000			31,685,000		8,331,000
Purchase price allocation, goodwill	$ 17,987,000			$ 32,379,000		$ 26,725,000