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Share Based Award (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of stock compensation and related tax benefits [Table Text Block]
The table below summarizes compensation costs and related tax benefits (in thousands):
 
 
Year ended December 31,
 (In thousands)
 
2019
 
2018
 
2017
Stock compensation expense
 
$
21,918

 
$
24,241

 
$
19,352

Tax benefit from stock-based compensation cost
 
$
4,840

 
$
5,706

 
$
7,247

Indirect tax benefit
 
$
680

 
$
2,199

 
$
1,374
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] The table below summarizes the total time-based stock options granted, total valuation and the weighted average assumptions (dollars in thousands, except per option amounts):
 
 
Year ended December 31,
 
 
2019
 
2018
 
2017
Number of time-based options granted
 
6,265

 
5,815

 
8,825

Grant date fair value of options granted (in thousands)
 
$
424

 
$
425

 
$
375

Weighted average assumptions for stock option valuation:
 
 
 
 
 
 
Expected term (years)
 
5.5

 
5.5

 
5.5

Expected stock price volatility
 
28.0
%
 
24.0
%
 
27.0
%
Risk-free interest rate
 
2.2
%
 
2.3
%
 
1.1
%
Expected dividend yield
 
—
%
 
—
%
 
—
%
Weighted average grant price per option
 
$
225.27

 
$
269.80

 
$
158.20

Weighted average grant date fair value per option
 
$
67.73

 
$
73.14

 
$
42.51
Share-based Payment Arrangement, Option, Activity [Table Text Block]
A summary of our stock option activity as of and for the year ended December 31, 2019 is as follows:
 
 
Shares
 
Weighted Average Exercise Price Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018
 
1,186,928

 
$
63.66

 
 
 
 
Granted
 
6,265

 
$
225.27

 
 
 
 
Exercised
 
(145,339
)
 
$
53.18

 
 
 
 
Forfeited or expired
 
—

 
$
—

 
 
 
 
Outstanding at December 31, 2019
 
1,047,854

 
$
66.08

 
4.1
 
$
127,556

Exercisable at December 31, 2019
 
1,041,589

 
$
65.12

 
4.0
 
$
127,556

Vested and expected to vest, December 31, 2019
 
1,047,854

 
$
66.08

 
4.1
 
$
127,556
Exercised Options Data [Table Text Block]
The following table presents information regarding stock option activity:
 
 
Year ended December 31,
(In thousands)
 
2019
 
2018
 
2017
Intrinsic value of options exercised
 
$
22,976

 
$
51,105

 
$
71,283

Cash received from exercise of stock options
 
$
7,732

 
$
14,275

 
$
32,003

Tax benefit from stock option exercises
 
$
9,653

 
$
12,617

 
$
20,004
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
The table below summarizes our restricted stock award activity (dollars in thousands):
 
 
Year ended December 31,
(In thousands except shares and per share amounts)
 
2019
 
2018
 
2017
PRSU
 
 
 
 
 
 
Shares granted
 
37,657

 
30,348

 
20,686

Shares earned
 
114,032

 
—

 
—

Grant date fair value per share
 
$
231.63

 
$
248.65

 
$
154.75

Grant date fair value
 
$
8,723

 
$
7,546

 
$
3,201

Intrinsic value vested
 
$
26,445

 
$
—

 
$
—

 
 
 
 
 
 
 
RSU
 
 
 
 
 
 
Shares granted
 
61,856

 
63,094

 
107,678

Grant date fair value per share
 
$
227.42

 
$
252.42

 
$
156.49

Grant date fair value
 
$
14,067

 
$
15,926

 
$
16,851

Intrinsic value vested
 
$
16,753

 
$
17,086

 
$
9,813
Nonvested Restricted Stock Shares Activity [Table Text Block]
The table below provides a summary of our PRSU and RSU activity as of and for the year ended December 31, 2019:  
 
 
Number of Units
 
Grant Date Fair Value Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value
Non-vested at December 31, 2018
 
340,704

 
$
155.27

 
 
 
 
Change in units due to performance expectations (a)
 
(14,444
)
 
$
238.03

 
 
 
 
Granted
 
99,513

 
$
229.01

 
 
 
 
Vested
 
(185,662
)
 
$
122.55

 
 
 
 
Forfeited
 
(7,584
)
 
$
216.29

 
 
 
 
Non-vested and expected to vest at December 31, 2019
 
232,527

 
$
205.82

 
0.7
 
$
43,510
Schedule of employee stock purchase plan (ESPP) [Table Text Block] The table below summarizes the number and intrinsic value of ESPP share purchases and the weighted average valuation assumptions for the 2017 purchase period.
 
 
 
2017
ESPP shares purchased by employees
23,426

Intrinsic value of ESPP purchases (in thousands)
$
986

Weighted average assumptions for ESPP valuation:
 
Expected term (in years)
0.5

Expected stock price volatility
28.1
%
Risk-free interest rate
0.6
%
Expected dividend yield
—
%