Equity Plans (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021, 2020 and 2019.

	Units	Weighted-Average Grant Date Fair Value
Unvested - January 1, 2019	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
Granted - restricted units	1,569,451	$	25.42
Granted - phantom units	17,726	$	28.48
Granted - performance units	715,674	$	28.46
Vested - restricted units	(906,275)	$	28.75
Vested - phantom units	(2,118)	$	26.63
Vested - performance units	(846,306)	$	29.85
Forfeited - restricted units	(149,001)	$	28.24
Forfeited - phantom units	(14,157)	$	27.91
Forfeited - performance units	(17,087)	$	27.35
Unvested - December 31, 2020	2,723,856	$	26.62
Granted - restricted units	1,399,781	$	20.51
Granted - phantom units	5,795	$	18.88
Granted - performance units	71,286	$	25.60
Vested - restricted units	(1,148,928)	$	27.65
Vested - phantom units	(2,117)	$	26.63
Forfeited - restricted units	(48,565)	$	21.67
Unvested - December 31, 2021	3,001,108	$	23.42