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Leases (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Rent expense $ 1.0us-gaap_LeaseAndRentalExpense $ 0.9us-gaap_LeaseAndRentalExpense $ 0.9us-gaap_LeaseAndRentalExpense
Sublease income 0.5us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 0.5us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 0.5us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Future minimum sublease income under noncancelable operating subleases $ 0.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals