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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
RSU Rollforward
The following table summarizes transactions for our unvested RSUs, excluding dividend equivalents, for 2020: 
Restricted Stock UnitsNumber of
RSUs		Weighted
Average
Grant-Date
Fair Value
December 31, 2019748,180 $27.73
Granted in 2020354,393 $37.28
Vested in 2020(411,593)$27.15
Forfeited in 2020(12,177)$32.35
December 31, 2020678,803 $32.98
Unvested Performance Award Rollforward
Details on the unvested amounts of these annual grants by performance period are as follows:
Performance-Based AwardsUnvested Awards OutstandingUnvested Weighted Average Grant Date Fair Value
Unvested awards at December 31, 2019227,697 $27.50
Above target performance adjustment122,281 $25.37
Vested in 2020(244,562)$25.37
Granted in 2020102,296 $37.29
Unvested awards at December 31, 2020207,712 $33.58
Vested Performance Award Rollforward A summary of vested awards still subject to the two year holding period is as follows:
Vested LTIP Awards Outstanding
Vested Awards at December 31, 2019243,171
Vested in 2020185,232
Completed holding period in 2020(105,834)
Vested Awards at December 31, 2020322,569