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Stock-based Compensation - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) - Employee Stock Option [Member] - 2014 Plan [Member]
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term 6 years 6 years 6 years
Volatility 20.27% 21.75% 21.63%
Dividend Yield 0.00% 0.00% 0.00%
Discount Rate 2.66% 2.03% 1.45%