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Equity Incentive Plan - Valuation Assumptions (Details) - $ / shares
Mar. 01, 2019
Mar. 01, 2018
Mar. 01, 2017
Jan. 28, 2016
Jun. 01, 2015
Outperformance Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares, Granted (in shares)         183,300
Estimate Value Per Unit (in dollars per share)         $ 14.13
Volatility, percentage         26.00%
Dividend Yield, percentage         4.50%
Risk Free Interest Rate, percentage         0.95%
Long Term Incentive Plan Units, Time-Based          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares, Granted (in shares) 88,746 97,968 89,574 72,966  
Estimate Value Per Unit (in dollars per share) $ 18.45 $ 16.83 $ 18.53 $ 16.69  
Volatility, percentage 21.00% 26.00% 24.00% 28.00%  
Dividend Yield, percentage 0.00% 0.00% 0.00% 0.00%  
Risk Free Interest Rate, percentage 2.57% 2.07% 0.92% 0.79%  
Long Term Incentive Plan Units, Performance-Based          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares, Granted (in shares) 133,107 146,949 134,348 39,285  
Estimate Value Per Unit (in dollars per share) $ 18.91 $ 17.02 $ 19.65 $ 11.09  
Volatility, percentage 21.00% 26.00% 25.00% 30.00%  
Dividend Yield, percentage 6.20% 6.20% 5.80% 5.80%  
Risk Free Interest Rate, percentage 2.55% 2.37% 1.47% 1.13%