Major Customers and Related Parties (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Related Party Transaction [Line Items]    
RevenueFromRelatedPartiesPercentage 36.50% 36.60%
Accounts Receivable, Related Parties $ 38.70 $ 38.70
AccountsReceivableRelatedPartiescustomerpercentage 20.80% 20.80%
AccountsReceivableRelatedPartiesPercentage 59.60% 59.60%