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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Assumptions Used In The Weighted Average Fair Value Of The Stock Options Granted The weighted average fair value of the Company’s stock options granted during 2017, 2016 and 2015 were $16.78, $12.43 and $12.16, respectively, using the following assumptions:
 
 
2017
 
2016
 
2015
Expected term (in years)
 
6.00

 
6.00

 
5.58

Expected volatility
 
22.58
%
 
25.44
%
 
23.86
%
Expected dividend yield
 
0.82
%
 
1.10
%
 
1.00
%
Risk-free interest rate
 
2.29
%
 
2.18
%
 
1.90
%
Stock-based Compensation Expense The Company recognized stock-based compensation expense in its Consolidated Financial Statements in 2017, 2016 and 2015 as follows:
 
 
2017
 
2016
 
2015
Stock-based compensation expense
 
$
36,366

 
$
16,017

 
$
17,312

Less: Deferred tax benefit
 
(7,891
)
 
(5,612
)
 
(6,107
)
Stock-based compensation expense, net of tax
 
$
28,475

 
$
10,405

 
$
11,205
Stock Option Plans This table presents certain information relating to the Company’s stock option plans for 2017, 2016 and 2015:
 
 
Number of
Shares
 
Weighted
Avg. Price
Balance as of December 31, 2014
 
20,461,000

 
$
25.26

Granted
 
2,005,000

 
53.34

Exercised
 
(2,927,000
)
 
21.44

Expired or canceled
 
(302,000
)
 
28.97

Balance as of December 31, 2015
 
19,237,000

 
$
28.71

Granted
 
2,310,000

 
49.57

Exercised
 
(1,809,000
)
 
24.82

Expired or canceled
 
(1,669,000
)
 
30.86

Balance as of December 31, 2016
 
18,069,000

 
$
31.57

Granted
 
2,057,000

 
69.87

Exercised
 
(2,370,000
)
 
21.22

Expired or canceled
 
(1,044,000
)
 
33.42

Balance as of December 31, 2017
 
16,712,000

 
$
37.63

 
 
 
 
 
Exercisable as of December 31, 2017
 
10,624,000

 
$
28.99

Available for future grant as of December 31, 2017
 
24,108,000

 
 
Stock Options Outstanding And Exercisable This table summarizes information relating to all options outstanding and exercisable at December 31, 2017:
 
 
 
Options Outstanding at December 31, 2017
 
Options Exercisable at December 31, 2017
Range of Exercise Prices (Per Share)
Number of Shares
 
Weighted Average
Exercise Price
(Per Share)
 
Weighted Average
Remaining
Contractual
Life (Years)
 
Number of Shares
 
Weighted Average
Exercise Price
(Per Share)
 
Weighted Average
Remaining
Contractual
Life (Years)
$
14.62

-
15.77
2,178,000

 
$
15.45

 
3.16
 
2,178,000

 
$
15.45

 
3.16
17.65

-
21.05
1,174,000

 
17.67

 
2.01
 
1,174,000

 
17.67

 
2.01
22.45

-
23.86
3,432,000

 
23.19

 
3.95
 
3,422,000

 
23.19

 
3.96
27.03

-
39.15
1,815,000

 
33.65

 
6.09
 
747,000

 
33.58

 
6.09
40.64

-
53.16
4,190,000

 
45.49

 
8.54
 
2,095,000

 
45.49

 
8.08
53.34

-
71.12
3,923,000

 
62.01

 
9.05
 
1,008,000

 
53.39

 
8.14
 
 
 
16,712,000

 
 
 
 
 
10,624,000

 
 
 
 
Common Stock Buyback The following table provides the total number of shares repurchased and the related total costs in 2017, 2016 and 2015:
Year
 
Total Number of
Shares Repurchased
 
Total Cost
2017
 
4,403,000

 
$
248,114

2016
 
6,600,000

 
294,374

2015
 
5,951,000

 
289,587