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Share-Based Compensation Tables (Tables)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]    
Schedule Of Share-based Compensation Costs Related To Unvested Restricted Stock [Table Text Block]
The remaining share-based compensation cost, net related to our unvested restricted shares outstanding as of December 31, 2021 is approximately $60.8 million. The following table summarizes our expected share-based compensation cost, net related to our unvested restricted shares, in thousands:

 202220232024Thereafter
Expected share-based compensation costs, net$25.1 $18.3 $10.2 $7.2 
  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes our restricted stock activity for the years ended December 31, 2021, 2020 and 2019:

 Number of SharesWeighted Average Grant Date Fair Value
Unvested restricted shares at January 1, 2019871,117 $72.65 
Granted190,020 $107.50 
Vested(237,406)$64.46 
Forfeited(10,690)$79.58 
Unvested restricted shares at December 31, 2019813,041 $83.10 
Granted261,731 $144.89 
Vested(258,280)$73.47 
Forfeited(5,678)$111.04 
Unvested restricted shares at December 31, 2020810,814 $105.92 
Granted290,607 $131.84 
Vested(305,747)$91.06 
Forfeited(7,654)$113.02 
Unvested restricted shares at December 31, 2021788,020 $121.18 
During the years ended December 31, 2021 and 2020, shares were granted as follows:

Grant PeriodTypePlanShares GrantedGrant Date Fair Value Per ShareVesting TypeVesting AnniversaryPercentage
2021Key Employees2015 Equity Incentive Plan2,500 $196.75 
(1)
Time Based
20.0% annually over 5 years
2021Key Employees2015 Equity Incentive Plan1,004 $202.31 
(1)
Time Based
25.0% annually over 4 years
2021Executive Officers2015 Equity Incentive Plan11,488 $196.39 
(1)
Time Based
20.0% annually over 5 years
2021Executive Officers2015 Equity Incentive Plan54,000 $151.89 
(1)
Time Based
20.0% annually over 5 years
2021Executive Officers2015 Equity Incentive Plan81,000 
(2)
$94.32 
(2)
Market Condition3rd100.0 %
2021Executive Officers2015 Equity Incentive Plan15,000 $151.89 
(1)
Time Based
33.3% annually over 3 years
2021Executive Officers2015 Equity Incentive Plan15,000 
(3)
$87.49 
(3)
Market Condition3rd100.0 %
2021Key Employees2015 Equity Incentive Plan28,856 $151.89 
(1)
Time Based
33.3% annually over 3 years
2021Key Employees2015 Equity Incentive Plan61,550 $143.28 
(1)
Time Based
20.0% annually over 5 years
2021Executive Officers2015 Equity Incentive Plan3,400 $147.19 
(1)
Time Based
20.0% annually over 5 years
2021Executive Officers2015 Equity Incentive Plan5,100 
(4)
$96.41 
(4)
Market Condition3rd100.0 %
2021Directors2004 Non-Employee Director Option Plan1,509 $147.19 
(1)
Time Based3rd100.0 %
2021Directors2004 Non-Employee Director Option Plan10,200 $148.44 
(1)
Time Based3rd100.0 %
2020Key Employees2015 Equity Incentive Plan13,873 $140.39 
(1)
Time Based
20.0% annually over 5 years
2020Executive Officers2015 Equity Incentive Plan69,368 $137.63 
(1)
Time Based
20.0% annually over 5 years
2020Key Employees2015 Equity Incentive Plan1,500 $143.20 
(1)
Time Based
20.0% annually over 5 years
2020Key Employees2015 Equity Incentive Plan51,790 $162.42 
(1)
Time Based
20.0% annually over 5 years
2020Executive Officers2015 Equity Incentive Plan46,000 $165.97 
(1)
Time Based
20.0% annually over 5 years
2020Executive Officers2015 Equity Incentive Plan69,000 
(5)
$125.47 
(5)
Market Condition3rd100.0 %
2020Directors2004 Non-Employee Director Option Plan10,200 $147.97 
(1)
Time Based3rd100.0 %
(1)The fair values of the grants were determined by using the average closing price of our common stock on the dates the shares were issued.
(2)Share-based compensation for restricted stock awards with market conditions is measured based on an estimate of shares expected to vest. We estimate the fair value of share-based compensation for restricted stock with market conditions using a Monte Carlo simulation. At the grant date our common stock price was $151.89. Based on the Monte Carlo simulation we expect 62.1 percent of the 81,000 shares to vest.
(3)Share-based compensation for restricted stock awards with market conditions is measured based on an estimate of shares expected to vest. We estimate the fair value of share-based compensation for restricted stock with market conditions using a Monte Carlo simulation. At the grant date our common stock price was $151.89. Based on the Monte Carlo simulation we expect 57.6 percent of the 15,000 shares to vest.
(4)Share-based compensation for restricted stock awards with market conditions is measured based on an estimate of shares expected to vest. We estimate the fair value of share-based compensation for restricted stock with market conditions using a Monte Carlo simulation. At the grant date our common stock price was $147.19. Based on the Monte Carlo simulation we expect 65.5 percent of the 5,100 shares to vest.
(5)Share-based compensation for restricted stock awards with market conditions is measured based on an estimate of shares expected to vest. We estimate the fair value of share-based compensation for restricted stock with market conditions using a Monte Carlo simulation. At the grant date our common stock price was $165.97. Based on the Monte Carlo simulation we expect 75.6 percent of the 69,000 shares to vest.