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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Share-Based Compensation Expense We recorded share-based compensation expense associated with our equity awards in the various expense categories in the Consolidated Statements of Income as set forth in the following table. In addition, $4.1 million and $3.9 million share-based compensation cost was capitalized as real estate facilities for the year ended December 31, 2022 and 2021, respectively (none in 2020).
For Years Ended December 31,
 202220212020
 (Amounts in thousands)
Self-storage cost of operations$17,950 $20,544 $14,904 
Ancillary cost of operations888 1,561 — 
General and administrative37,865 37,760 18,586 
Total$56,703 $59,865 $33,490 
Share-Based Payment Arrangement, Option, Activity Additional information with respect to stock options during 2022, 2021, and 2020 is as follows:
Service-BasedPerformance-BasedTotal
Number of OptionsWeighted Average Exercise Price per ShareNumber of OptionsWeighted Average Exercise Price per ShareNumber of OptionsWeighted Average Exercise Price per Share
Options outstanding January 1, 2020
2,339,667 $204.53 — $— 2,339,667 $204.53 
Granted70,000 200.61 770,000 228.94 840,000 226.58 
Exercised(71,500)(175.16)— — (71,500)(175.16)
Cancelled(107,000)(220.33)(40,000)(228.94)(147,000)(222.67)
Options outstanding December 31, 2020
2,231,167 $204.60 730,000 $228.94 2,961,167 $210.59 
Granted (a)140,000 248.54 420,000 229.53 560,000 234.29 
Exercised(471,216)(203.30)— — (471,216)(203.30)
Cancelled— — (10,000)(228.94)(10,000)(228.94)
Options outstanding December 31, 2021
1,899,951 $208.16 1,140,000 $229.16 3,039,951 $216.04 
Granted (b)65,000 398.97 138,933 299.88 203,933 331.46 
Special dividend adjustment (c)62,512  N/A 41,836  N/A 104,348  N/A
Exercised(173,422)(189.95)(10,327)(221.68)(183,749)(191.74)
Cancelled— — — — — — 
Options outstanding December 31, 2022 (d)
1,854,041 $209.53 1,310,442 $229.39 3,164,483 $217.75 
Options exercisable at December 31, 2022 (d)
1,617,555 $200.87 10,327 $221.68 1,627,882 $201.00 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
202220212020
Aggregate exercise date intrinsic value of options exercised during the year (in 000's)$27,210$44,613$3,433
Average assumptions used in valuing options with the Black-Scholes method:
Expected life of options in years655
Risk-free interest rate2.9%0.8%0.4%
Expected volatility, based upon historical volatility22.9%24.1%21.6%
Expected dividend yield2.0%2.9%3.8%
Average assumptions used in valuing options with market conditions with the Monte-Carlo simulation method:
Expected life of options in years75
Risk-free interest rate1.8%0.9%
Expected volatility, based upon historical volatility22.6%26.5%
Expected dividend yield2.3%2.9%
Average estimated value of options granted during the year$87.57$62.66$17.79
(a) Amount granted for performance-based stock options includes performance adjustments above target for options granted in 2020.
(b) Amount granted for performance-based stock options includes performance adjustments above target for options granted in 2021.
(c) On August 4, 2022, we paid a Special Dividend of $13.15 per common share to shareholders of record as of August 1, 2022. Stock options that were outstanding at the time of the Special Dividend were adjusted pursuant to the anti-dilution provisions of the Company’s applicable equity and performance-based incentive compensation plans that provide for equitable adjustments in the event of an extraordinary cash dividend. The anti-dilution adjustments
proportionately increased the number of outstanding stock options and reduced the exercise prices of outstanding stock options by a conversion rate of 1.03275, resulting in an increase of 104,348 stock options outstanding. The adjustments did not result in incremental share-based compensation expense.
(d) The weighted average exercise price of options outstanding and options exercisable at December 31, 2022 reflect the adjusted exercise price post the anti-dilution adjustment on August 3, 2022.
Schedule of Share-based Payment Arrangement, Restricted Stock Unit, Activity The following tables set forth relevant information with respect to restricted shares (dollar amounts in thousands):
Service-BasedPerformance-BasedTotal
Number of Restricted Share UnitsWeighted-Average Grant-Date Fair ValueNumber of Restricted Share UnitsWeighted-Average Grant-Date Fair ValueNumber of Restricted Share UnitsWeighted-Average Grant-Date Fair Value
Restricted share units outstanding January 1, 2020619,150 $213.29 — $— 619,150 $213.29 
Granted110,755 222.27 — — 110,755 222.27 
Vested(140,089)(200.88)— — (140,089)(200.88)
Forfeited(37,028)(215.08)— — (37,028)(215.08)
Restricted share units outstanding December 31, 2020552,788 $218.11 — $— 552,788 $218.11 
Granted (a)143,068 336.06 46,250 275.12 189,318 321.17 
Vested(138,420)(216.63)— — (138,420)(216.63)
Forfeited(32,864)(221.32)— — (32,864)(221.32)
Restricted share units outstanding December 31, 2021524,572 $249.90 46,250 $275.12 570,822 $251.95 
Granted51,575 293.43 21,985 465.11 73,560 344.74 
Vested(146,138)(240.71)— — (146,138)(240.71)
Forfeited(22,197)(256.50)— — (22,197)(256.50)
Restricted share units outstanding December 31, 2022407,812 $258.34 68,235 $336.33 476,047 $269.52 
Schedule of Share-Based Payment Award, Restricted Stock Units, Valuation Assumptions
202220212020
Amounts for the year (in 000's, except number of shares):
Fair value of vested shares on vesting date$47,244 $37,430 $31,076 
Cash paid for taxes upon vesting in lieu of issuing common shares$16,827 $13,069 $10,518 
Common shares issued upon vesting99,009 81,325 91,627 
Average assumptions used in valuing restricted share units with market conditions with the Monte-Carlo simulation method:
Time from the valuation date to the end of the performance period3
Risk-free interest rate1.6%
Expected volatility, based upon historical volatility26.5%
Expected dividend yield2.3%
Average estimated value of restricted share units granted during the year$465.11 
(a)Amount includes adjustments above target for performance-based RSUs granted in fiscal year 2021 based on achievement of performance criteria.