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Employees, Retirement and Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity
A summary of restricted and phantom unit activity and changes during the six months ended June 30, 2020, is presented below:
Restricted and Phantom Units
 
Units
 
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2020 (nonvested)
 
145,205

 
$
26.22

Vesting and transfer of full ownership to recipients
 
(4,397
)
 
30.29

Forfeited
 
(5,890
)
 
25.33

Outstanding at June 30, 2020 (nonvested)
 
134,918

 
$
26.13
Schedule of Nonvested Performance-based Units Activity

A summary of performance unit activity and changes for the six months ended June 30, 2020, is presented below:
Performance Units
 
Units
Outstanding at January 1, 2020 (nonvested)
 
53,445

Vesting and transfer of common units to recipients
 
(11,634
)
Outstanding at June 30, 2020 (nonvested)
 
41,811