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Accounting Policies Operating Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Operating Leases, Rent Expense $ 0.7us-gaap_LeaseAndRentalExpense $ 0.7us-gaap_LeaseAndRentalExpense $ 0.6us-gaap_LeaseAndRentalExpense