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Employee Compensation Plans - Schedule of Stock Compensation Assumptions Used (Details) | Dec. 31, 2017 USD ($)
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January Fourteen Two Thousand Thirteen [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 | 20.683%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate | 0.613%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments | $ 0
January Six Two Thousand Seventeen [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 | 34.439%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate | 2.089%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments | $ 0
January Six Two Thousand Sixteen [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 | 35.174%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate | 1.971%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments | $ 0
January Nine Two Thousand Fifteen [Member] |
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 | 32.249%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate | 1.887%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments | $ 0
January Fourteen Two Thousand Fourteen [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 | 27.995%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Risk Free Interest Rate | 1.738%
Share-based Compensation Arrangement by Cash Payment Award Stock Appreciation Rights, Fair Value Assumptions, Expected Dividend Payments | $ 0

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