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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation [Abstract]  
LTIP Unit Award Valuation Assumptions
The fair values of the LTIP Unit Awards at issuance were determined by a lattice-binomial option-pricing model based on Monte Carlo simulations using the following assumptions:
 
Year Ended December 31, 2018
 
Year Ended December 31, 2017
Expected dividend yield
2.67
%
 
2.71
%
Expected volatility - range used
15.83% - 17.87%

 
21.50% - 21.80%

Expected volatility - weighted average
17.02
%
 
21.68
%
Risk-free interest rate
1.57% - 2.04%

 
0.66% - 1.58%
Summary of Restricted Stock/Unit Award and LTIP Unit Award Transactions
Restricted stock or restricted Unit award and LTIP Unit Award transactions for the year ended December 31, 2018 are summarized as follows:
 
Awards
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2017
1,112,828

 
$
15.31

Issued
406,347

 
$
22.00

Forfeited
(48,823
)
 
$
17.47

Vested
(469,533
)
 
$
15.55

Outstanding at December 31, 2018
1,000,819

 
$
17.81