Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

RSU Rollforward

The following table summarizes transactions for our unvested RSUs, excluding dividend equivalents, for 2021: 

Restricted Stock Units	Number of RSUs	Weighted Average Grant-Date Fair Value
December 31, 2020	678,803	$32.98
Granted in 2021	322,227	$42.15
Vested in 2021	(368,428)	$31.66
Forfeited in 2021	(41,760)	$37.47
December 31, 2021	590,842	$38.49

Unvested Performance Award Rollforward

Details on the unvested amounts of these annual grants by performance period are as follows:

Performance-Based Awards	Unvested Awards Outstanding	Unvested Weighted Average Grant Date Fair Value
Unvested awards at December 31, 2020	207,712	$33.58
Above target performance adjustment	105,416	$29.98
Vested in 2021	(210,832)	$29.98
Granted in 2021	97,527	$42.07
Unvested awards at December 31, 2021	199,823	$39.62

Vested Performance Award Rollforward

A summary of vested performance-based awards that are denominated in LTIP units is as follows:

	Vested LTIP Awards Outstanding
Vested Awards at December 31, 2020	322,569
Vested in 2021	148,518
Completed holding period in 2021	(142,324)
Vested Awards at December 31, 2021	328,763