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Long-Term Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
LTIP Unit Award Valuation Assumptions The fair values were determined by a lattice-binomial option-pricing model based on Monte Carlo simulations using the following assumptions:
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
Year Ended December 31, 2017
Expected dividend yield
3.02
%
 
2.67
%
 
2.71
%
Expected volatility - range used
18.53% - 19.72%

 
15.83% - 17.87%

 
21.50% - 21.80%

Expected volatility - weighted average
19.10
%
 
17.02
%
 
21.68
%
Risk-free interest rate
2.45% - 2.57%

 
1.57% - 2.04%

 
0.66% - 1.58%
Summary of Performance Award Transactions
Performance Award transactions for the year ended December 31, 2019 are summarized as follows:
 
Performance Units
 
Weighted
Average
Grant Date
Fair Value
 
Performance LTIP Units
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2018
595,383

 
$
11.79

 
—

 
$
—

Issued
36,064

 
$
12.45

 
166,942

 
$
12.45

Forfeited
(13,455
)
 
$
12.97

 
(10,240
)
 
$
12.45

Vested
(237,270
)
 
$
10.06

 
—

 
$
—

Outstanding at December 31, 2019
380,722

 
$
12.89

 
156,702

 
$
12.45
Summary of Restricted Stock/Unit Award and LTIP Unit Award Transactions Service Based Award transactions for the year ended December 31, 2019 are summarized as follows:
 
Restricted Stock Awards
 
Weighted
Average
Grant Date
Fair Value
 
Service LTIP Units
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2018
405,436

 
$
26.64

 
—

 
$
—

Issued
109,353

 
$
35.17

 
112,428

 
$
33.64

Forfeited
(9,851
)
 
$
29.48

 
(1,788
)
 
$
33.58

Vested
(208,567
)
 
$
25.40

 
—

 
$
—

Outstanding at December 31, 2019
296,371

 
$
30.56

 
110,640

 
$
33.64