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Equity Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The following table summarizes information regarding restricted, phantom and performance unit activity during the years ended December 31, 2019, 2018 and 2017.
 
 
Units
 
Weighted-Average Grant Date Fair Value
Unvested - January 1, 2017
 
1,292,330

 
$
24.67

Granted - restricted units
 
919,411

 
$
25.69

Granted - phantom units
 
15,849

 
$
25.02

Granted - performance units
 
405,620

 
$
30.21

Vested - restricted units
 
(607,115
)
 
$
28.00

Vested - performance units
 
(31,106
)
 
$
30.27

Forfeited - restricted units
 
(140,137
)
 
$
23.73

Forfeited - performance units
 
(24,756
)
 
$
30.45

Unvested - December 31, 2017
 
1,830,096

 
$
25.21

Granted - restricted units
 
1,144,017

 
$
25.80

Granted - phantom units
 
7,750

 
$
26.10

Granted - performance units
 
901

 
$
25.60

Vested - restricted units
 
(617,807
)
 
$
23.73

Vested - phantom units
 
(105,809
)
 
$
49.45

Vested - performance units
 
(11,772
)
 
$
28.87

Forfeited - restricted units
 
(53,530
)
 
$
23.36

Forfeited - phantom units
 
(6
)
 
$
49.45

Forfeited - performance units
 
(5,870
)
 
$
30.45

Unvested - December 31, 2018
 
2,187,970

 
$
24.78

Granted - restricted units
 
988,096

 
$
31.48

Granted - phantom units
 
7,164

 
$
29.03

Granted - performance units
 
238,263

 
$
34.21

Vested - restricted units
 
(985,751
)
 
$
23.39

Vested - performance units
 
(32,246
)
 
$
34.21

Forfeited - restricted units
 
(47,547
)
 
$
27.85

Unvested - December 31, 2019
 
2,355,949

 
$
28.94