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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Securities To Be Issued and Remaining Available For Future Issuance
The following table summarizes the number of securities to be issued and remaining available for future issuance under all of the Company’s stock incentive plans as of December 31, 2020:
Number of securities to be issued upon vesting of RSUs and performance share awardsWeighted-average exercise price of vesting of RSUs and performance share awardsNumber of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column 1)
2007 Long-Term Incentive Plan(1)
1,624 $0.01 — 
2010 Long-Term Incentive Plan(2)
330,750 0.01 — 
2019 Long-Term Incentive Plan(2)
430,643 0.01 3,156,745 
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(1)    Includes RSUs.
(2)    Includes RSUs and performance shares.
Schedule of Share-based Compensation, Activity
The following table summarizes the activity for all RSUs and performance shares under all of the Long-Term Incentive Plans (“LTIPs”) for the year ended December 31, 2020:
  December 31, 2019Activity during 2020December 31, 2020
  OutstandingGrantedVested / ExercisedCanceled/ForfeitedOutstandingExercisable
PlansSecuritiesNumberPriceNumberPriceNumberPriceNumberPriceNumberPriceNumberPrice
2007 LTIPRSUs1,624 $0.01 — $— — $— — $— 1,624 $0.01 1,624 $0.01 
2010 LTIPRSUs442,116 0.01 — 
(1)
— (221,955)0.01 (17,275)0.01 202,886 0.01 — — 
Performance shares225,252 0.01 — 

— (89,547)0.01 (7,841)0.01 127,864 0.01 — — 
2019 LTIPRSUs6,927 0.01 280,325 
(1)
0.01 (2,309)0.01 — — 284,943 0.01 — — 
Performance shares10,159 0.01 154,363 
(2)
0.01 (3,386)0.01 (15,436)0.01 145,700 0.01 — — 
Total 686,078 434,688 (317,197)(40,552)763,017 1,624 
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 Note: Price is weighted-average price per share.
(1)Consists of non-performance RSUs.
(2)In 2020, the Company awarded a maximum of 154,363 performance shares that would be received if the highest level of performance was achieved. Subsequent to December 31, 2020, 138,927 performance shares were earned based upon 2020 performance criteria.
The following table summarizes the aggregate intrinsic value of awards vested and exercised (in millions):
Year Ended December 31,
202020192018
Aggregate intrinsic value of awards vested and exercised:
RSUs$5.8 $5.5 $3.8 
Performance shares2.4 1.6 1.2 
Assumptions Used for Fair Value
The fair values for RSUs and performance shares, which are based on the fair market value of the Company’s stock at date of grant, are included below:
Year Ended December 31,
202020192018
Weighted-average fair value per share of grants:
RSUs$25.38 $29.67 $23.66 
Performance shares(1)
$25.48 $29.90 $23.78 
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(1)    Of the 154,363 performance shares awarded in 2020, 138,927 were earned based upon 2020 performance criteria. Of the 154,511 performance shares awarded in 2019, all were earned based upon 2019 performance criteria.
Schedule of Stock Options, Restricted Stock Units and Performance Shares Vested and Expected to Vest
The following table summarizes RSUs and performance shares that have vested and are expected to vest as of December 31, 2020:
December 31, 2020
OutstandingWeighted-Average Remaining Contractual Term (years)
Aggregate Intrinsic Value(1)
(dollars in thousands)
PlansSecuritiesVested
Expected to vest(2)
Vested
Expected to vest(2)
Vested
Expected to vest(2)
2007 LTIPRSUs1,624 — — — $48 $— 
2010 LTIPRSUs— 195,462 — — — 5,739 
Performance shares— 127,261 — — — 3,736 
2019 LTIPRSUs— 275,198 — — — 8,080 
Performance shares— 144,243 — — — 4,235 
Total1,624 742,164 $48 $21,790 

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(1)    Aggregate intrinsic value is calculated based upon the difference between the exercise price of RSUs and the Company’s closing common stock price on December 31, 2020 of $29.37, multiplied by the number of instruments that are vested or expected to vest. RSUs having grant prices greater than the closing stock price noted above are excluded from this calculation.
(2)    RSUs and performance shares that are expected to vest are net of estimated future forfeitures.