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Share Based Award (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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)
 
2017
 
2016
 
2015
Stock compensation expense
 
$
19,352

 
$
15,242

 
$
12,827

Tax benefit from stock-based compensation cost
 
$
7,247

 
$
5,682

 
$
4,922

Indirect tax benefit
 
$
1,374

 
$
—

 
$
1,997
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):
 
 
Year ended December 31,
 
 
2017
 
2016
 
2015
Number of time-based options granted
 
8,825

 
13,405

 
22,816

Grant date fair value of options granted (in thousands)
 
$
375

 
$
413

 
$
590

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

 
5.5

 
5.6

Expected stock price volatility
 
27.0
%
 
31.8
%
 
25.9
%
Risk-free interest rate
 
1.1
%
 
0.7
%
 
1.7
%
Expected dividend yield
 
—
%
 
—
%
 
—
%
Weighted average grant price per option
 
$
158.20

 
$
101.32

 
$
93.30

Weighted average grant date fair value per option
 
$
42.51

 
$
30.78

 
$
25.86
Schedule of Share-based compensation, performance stock option activity [Table Text Block]
The table below summarizes the performance stock options granted, the total valuation and the weighted average assumptions (dollars in thousands). There were no performance option grants in 2017 or 2016.

 
 
Year ended December 31,
 
 
2017
 
2016
 
2015
Number of performance options granted
 
 
 
 
 
244,825

Number of performance options earned
 

 
244,825

 
349,812

Grant date fair value of options granted (in thousands)
 
 
 
 
 
$
6,087

Weighted average assumptions for stock option valuation:
 
 
 
 
 
 
Expected term (years)
 
 
 
 
 
3.0

Expected stock price volatility
 
 
 
 
 
30.86
%
Risk-free interest rate
 
 
 
 
 
2.3
%
Expected dividend yield
 
 
 
 
 
—
%
Weighted average grant price per option
 
 
 
 
 
$
91.88

Weighted average grant date fair value per option
 
 
 
 
 
$
24.86
Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of our stock option activity as of and for the year ended December 31, 2017 is as follows:
 
 
 
Shares
 
Weighted Average Exercise Price Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2016
 
2,018,290

 
$
58.90

 
 
 
 
Granted
 
8,825

 
$
158.20

 
 
 
 
Exercised
 
(610,316
)
 
$
52.43

 
 
 
 
Forfeited or expired
 
(72
)
 
$
58.79

 
 
 
 
Outstanding at December 31, 2017
 
1,416,727

 
$
62.30

 
5.8
 
$
217,749

Exercisable at December 31, 2017
 
1,133,734

 
$
60.13

 
5.6
 
$
176,721

Vested and expected to vest, December 31, 2017
 
1,416,727

 
$
62.30

 
5.8
 
$
217,749
Exercised Options Data [Table Text Block]
 
 
 
Year ended December 31,
(In thousands)
 
2017
 
2016
 
2015
Intrinsic value of options exercised
 
$
71,283

 
$
25,065

 
$
28,071

Cash received from exercise of stock options
 
$
32,003

 
$
17,346

 
$
15,042

Tax benefit from stock option exercises
 
$
20,004

 
$
7,556

 
$
9,330
Schedule of Share-based Compensation, Restricted Stock Units Award 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)
 
2017
 
2016
 
2015
PRSU
 
 
 
 
 
 
Shares granted
 
20,686

 
36,370

 
—

Shares earned
 
—

 
—

 
—

Grant date fair value per share
 
$
154.75

 
$
86.47

 
$
—

Grant date fair value
 
$
3,201

 
$
3,145

 
$
—

Intrinsic value vested
 
$
—

 
$
—

 
$
787

 
 
 
 
 
 
 
RSU
 
 
 
 
 
 
Shares granted
 
107,678

 
60,377

 
67,745

Grant date fair value per share
 
$
156.49

 
$
87.47

 
$
93.52

Grant date fair value
 
$
16,851

 
$
5,281

 
$
6,336

Intrinsic value vested
 
$
9,813

 
$
4,680

 
$
2,754
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, 2017.
 
 
 
Number of Units
 
Grant Date Fair Value Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value
Non-vested at December 31, 2016
 
159,439

 
$
84.68

 
 
 
 
Change in units due to performance expectations (a)
 
72,740

 
$
86.47

 
 
 
 
Granted
 
128,364

 
$
156.21

 
 
 
 
Vested
 
(66,278
)
 
$
80.61

 
 
 
 
Forfeited
 
(8,762
)
 
$
148.76

 
 
 
 
Non-vested and expected to vest at December 31, 2017
 
285,503

 
$
116.28

 
1.0
 
$
33,197
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, 2016 and 2015 purchase periods.

 
 
Year ended December 31,
 
 
2017
 
2016
 
2015
ESPP shares purchased by employees
 
23,426

 
31,227

 
34,299

Intrinsic value of ESPP purchases (in thousands)
 
$
986

 
$
955

 
$
1,382

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

 
0.5

 
0.5

Expected stock price volatility
 
28.1
%
 
32.5
%
 
27.0
%
Risk-free interest rate
 
0.6
%
 
0.3
%
 
0.6
%
Expected dividend yield
 
—
%
 
—
%
 
—
%