Employee Compensation Plans - Schedule of Stock Compensation Assumptions Used (Details) - Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2018 USD ($)
January Five Two Thousand Eighteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	4 years
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Fair Value Assumptions Expected Volatility Rate	33.027%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate	2.49%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments	$ 0.44
January Six Two Thousand Seventeen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	3 years
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Fair Value Assumptions Expected Volatility Rate	29.016%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate	2.462%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments	$ 0.44
January Six Two Thousand Sixteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	2 years
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Fair Value Assumptions Expected Volatility Rate	26.671%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate	2.483%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments	$ 0.44
January Nine Two Thousand Fifteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	1 year
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Fair Value Assumptions Expected Volatility Rate	27.634%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate	2.587%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments	$ 0.44
January Fourteen Two Thousand Fourteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	13 days
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Fair Value Assumptions Expected Volatility Rate	28.21%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate	1.213%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments	$ 0.44