Stock-Based Compensation Stock Option Black Scholes Option Pricing Model Assumptions (Details) (Employee Stock Option [Member])	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Employee Stock Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Dividend yield	0.00%	0.00%
Expected volatility	34.50%	39.80%
Risk-free interest rate	1.70%	1.70%
Expected term (years)	5 years 5 months 25 days	5 years 5 months 30 days