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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]      
Operating Leases, Rent Expense, Net $ 3.3us-gaap_OperatingLeasesRentExpenseNet $ 2.1us-gaap_OperatingLeasesRentExpenseNet $ 2.0us-gaap_OperatingLeasesRentExpenseNet