Stock-Based Compensation Stock Option Black Scholes Option Pricing Model Assumptions (Details) - Employee Stock Option [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility	33.50%	34.30%	39.30%
Risk-free interest rate	1.30%	1.70%	1.70%
Expected term (years)	5 years 6 months	5 years 6 months	5 years 6 months