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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Schedule of Share-based Payment Awards: Valuation Assumptions
As mentioned above, 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, 2015
 
Year Ended December 31, 2013
Expected dividend yield
1.99
%
 
2.22
%
Expected volatility - range used
20.43% - 21.99%

 
24.28% - 34.66%

Expected volatility - weighted average
21.34
%
 
30.61
%
Risk-free interest rate
0.10% - 1.16%

 
0.03% - 0.71%

Expected term
3 years

 
1 - 2.5 years
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, 2015 are summarized as follows:
 
Awards
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2014
816,718

 
$
12.68

Issued
498,792

 
$
15.21

Forfeited
(4,313
)
 
$
13.68

Vested
(661,222
)
 
$
11.87

Outstanding at December 31, 2015
649,975

 
$
15.43