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Stock-Based Compensation (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price | $ / shares $ 59.90
Weighted Average Price Per LTIP  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments | $ $ 0.4700
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 3.09%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 91.56%
Long Term Incentive Plan [Member] | Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | shares 29,380
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share | $ / shares $ 57.05
Weighted-Average Price Per Share  
Unrecognized compensation expense | $ $ 3,100,000
Unrecognized compensation cost, period for recognition through 2019
Long Term Incentive Plan [Member] | Performance Shares [Member] | Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangements by Share-based Payment Award, Conversion Ratio, Percent of Target 200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years
Long Term Incentive Plan [Member] | Performance Shares [Member] | Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangements by Share-based Payment Award, Conversion Ratio, Percent of Target 0.00%
Long Term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number of Common Shares to be Issued Per Award | shares 1
Number of RSUs [Roll Forward]  
Granted | shares 18,020
Weighted-Average Price Per Share  
Granted | $ / shares $ 59.90
Unrecognized compensation expense | $ $ 3,100,000
Unrecognized compensation cost, period for recognition through 2022