Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017		Year Ended December 31, 2016
Expected dividend yield	2.71	%	2.31	%
Expected volatility - range used	21.50% - 21.80%		21.01% - 21.19%
Expected volatility - weighted average	21.68	%	20.92	%
Risk-free interest rate	0.66% - 1.58%		0.48% - 1.43%

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, 2017 are summarized as follows:



	Awards		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016	917,532		$	14.35
Issued	471,744		$	20.70
Forfeited	(8,034	)	$	19.61
Vested	(268,414	)	$	21.36
Outstanding at December 31, 2017	1,112,828		$	15.31