Stock-Based Compensation Stock Option Black Scholes Option Pricing Model Assumptions (Details) - Employee Stock Option [Member]	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Dividend yield	0.00%	0.00%
Expected volatility	33.50%	34.50%
Risk-free interest rate	1.30%	1.70%
Expected term (years)	5 years 5 months 14 days	5 years 5 months 14 days