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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Stock-Based Compensation Expense

Year ended December 31,

2019

2018

2017

Stock-based compensation

$

92,062

$

69,947

$

66,396

Stock-based compensation, net of income taxes

$

73,866

$

51,544

$

40,370

Total capitalized stock-based compensation included in net leasehold improvements, property and equipment on the consolidated balance sheets

$

666

$

783

$

1,141

Excess tax benefit (deficit) on stock-based compensation recognized in provision for income taxes

$

16,203

$

(6,162)

$

448

SOSARS [Member]  
Summary Of Option And SOSAR Activity Under Incentive Plan

Shares

Weighted-Average Exercise Price per Share

Weighted-Average Remaining Contractual Life (Years)

Aggregate Intrinsic Value

Outstanding, January 1, 2019

2,151

$

474.51

$

49,160

Granted

201

601.59

Exercised

(1,130)

510.35

Forfeited or cancelled

(40)

483.11

Expired

(50)

559.29

Outstanding, December 31, 2019

1,132

457.14

4.4

430,270

Exercisable, December 31, 2019

365

505.35

2.4

121,242

Vested and expected to vest, December 31, 2019

1,095

454.76

4.3

418,815

Schedule Of Assumptions For SOSAR And PSUs

2019

2018

2017

Risk-free interest rate

2.4

%

2.4

%

1.6

%

Expected life (years)

3.9

3.9

3.7

Expected dividend yield

0.0

%

0.0

%

0.0

%

Volatility

34.7

%

32.2

%

29.9

%

Weighted-average Black-Scholes fair value per share at date of grant

$

176.79

$

77.61

$

105.97

Restricted Stock Units (RSUs) [Member]  
Summary Of Non-Vested Stock Award Activity Under Incentive Plan

Shares

Weighted-Average Grant Date Fair Value per Share

Outstanding, January 1, 2019

154

$

352.85

Granted

28

627.94

Vested

(46)

388.08

Forfeited or cancelled

(15)

303.84

Outstanding, December 31, 2019

121

408.56

Vested and expected to vest, December 31, 2019

113

401.74

Performance Stock Awards (PSUs) [Member]  
Summary Of Non-Vested Stock Award Activity Under Incentive Plan

Shares

Weighted-Average Grant Date Fair Value per Share

Outstanding, January 1, 2019

70

$

418.52

Granted

46

583.13

Vested

-

-

Expired

(13)

518.62

Outstanding, December 31, 2019

103

479.83

Vested and expected to vest, December 31, 2019

227

479.61

Schedule Of Assumptions For SOSAR And PSUs

2017

Risk-free interest rate

1.5

%

Expected life (years)

3.0

Expected dividend yield

0.0

%

Volatility

29.9

%