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Stock-Based Compensation (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense $ 2.0us-gaap_AllocatedShareBasedCompensationExpense $ 2.3us-gaap_AllocatedShareBasedCompensationExpense