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Shareholders' Equity Contingent Consideration - infiNET Integrated Solutions, Inc. (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
infiNET purchase, 2004 [Member]
 
Business Acquisition [Line Items]  
Business Acquisition, Percentage of Voting Interests Acquired 50.00%
infiNET purchase, 2006 [Member]
 
Business Acquisition [Line Items]  
Business Acquisition, Percentage of Voting Interests Acquired 50.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 95,380
Business Acquisition, Preacquisition Contingency, Amount of Settlement $ 5.9