Share-Based Payments (Black Scholes Option Pricing Model Assumptions) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum	18.16%	21.03%
Expected volatility, maximum	38.35%	42.71%
Expected dividend yield	0.15%	0.16%
Risk-free rate, minimum	0.11%	0.12%
Risk-free rate, maximum	1.63%	3.93%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of options	3 years 7 months 6 days	0 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of options	9 years 2 months 12 days	10 years
Weighted-average [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, weighted-average	22.24%	30.50%
Risk-free rate, weighted-average	0.55%	2.10%