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Significant Concentrations (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2011
SVA - NEC [Member]
Dec. 31, 2010
SVA - NEC [Member]
Dec. 31, 2012
SVA - NEC [Member]
Dec. 31, 2008
SVA - NEC [Member]
Dec. 31, 2012
Sales Revenue, Services, Net [Member]
Customer A And Its Affiliates [Member]
Dec. 31, 2011
Sales Revenue, Services, Net [Member]
Customer A And Its Affiliates [Member]
Dec. 31, 2010
Sales Revenue, Services, Net [Member]
Customer A And Its Affiliates [Member]
Dec. 31, 2012
Sales Revenue, Services, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2011
Sales Revenue, Services, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2010
Sales Revenue, Services, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2012
Accounts Receivable [Member]
Customer A And Its Affiliates [Member]
Dec. 31, 2011
Accounts Receivable [Member]
Customer A And Its Affiliates [Member]
Dec. 31, 2012
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Dec. 31, 2011
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Concentration Risk, Percentage         11.70% 5.70% 0.20% 34.20% 40.80% 52.20% 14.00% 10.30% 35.10% 44.10%
Accounts Receivable Gross $ 15.2   $ 15.2                      
Allowance For Doubtful Accounts Receivable 15.2   15.2 25.3                    
Recovery Of Bad Debts Allowance $ 1.5 $ 8.6