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Share Based Award (Tables)
 12 Months Ended
Dec. 31, 2016
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)
 
2016
 
2015
 
2014
Stock compensation expense
 
$
15,242

 
$
12,827

 
$
9,592

Tax benefit from stock-based compensation cost
 
$
5,682

 
$
4,922

 
$
3,567

Indirect tax benefit
 
$
—

 
$
1,997

 
$
209
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,
 
 
2016
 
2015
 
2014
Number of time-based options granted
 
13,405

 
22,816

 
492,935

Grant date fair value of options granted (in thousands)
 
$
413

 
$
590

 
$
7,311

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

 
5.6

 
4.7

Expected stock price volatility
 
31.8
%
 
25.9
%
 
26.7
%
Risk-free interest rate
 
0.7
%
 
1.7
%
 
1.4
%
Expected dividend yield
 
—
%
 
—
%
 
—
%
Weighted average grant price per option
 
$
101.32

 
$
93.30

 
$
58.92

Weighted average grant date fair value per option
 
$
30.78

 
$
25.86

 
$
14.83
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 2016.


 
 
Year ended December 31,
 
 
2016
 
2015
 
2014
Number of performance options granted
 
 
 
244,825

 
699,625

Number of performance options earned
 
244,825

 
349,812

 
349,813

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

 
$
13,344

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

 
4.0

Expected stock price volatility
 
 
 
30.86
%
 
31.7
%
Risk-free interest rate
 
 
 
2.3
%
 
2.9
%
Expected dividend yield
 
 
 
—
%
 
—
%
Weighted average grant price per option
 
 
 
$
91.88

 
$
58.90

Weighted average grant date fair value per option
 
 
 
$
24.86

 
$
19.07
Schedule of 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, 2016 is as follows:
 
 
 
Shares
 
Weighted Average Exercise Price Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2015
 
2,379,407

 
$
56.90

 
 
 
 
Granted
 
13,405

 
$
101.32

 
 
 
 
Exercised
 
(366,065
)
 
$
47.38

 
 
 
 
Forfeited or expired
 
(8,457
)
 
$
62.57

 
 
 
 
Outstanding at December 31, 2016
 
2,018,290

 
$
58.90

 
6.4
 
$
178,521

Exercisable at December 31, 2016
 
1,354,853

 
$
54.44

 
5.8
 
$
125,878

Vested and expected to vest, December 31, 2016
 
2,018,290

 
$
58.90

 
6.4
 
$
178,521
Exercised Options Data [Table Text Block]
 
 
 
Year ended December 31,
(In thousands)
 
2016
 
2015
 
2014
Intrinsic value of options exercised
 
$
25,065

 
$
28,071

 
$
18,802

Cash received from exercise of stock options
 
$
17,346

 
$
15,042

 
$
16,998

Tax benefit from stock option exercises
 
$
7,556

 
$
9,330

 
$
5,700
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)
 
2016
 
2015
 
2014
PRSU
 
 
 
 
 
 
Shares granted
 
36,370

 
—

 
—

Shares earned
 
—

 
—

 
—

Grant date fair value per share
 
$
86.47

 
$
—

 
$
—

Grant date fair value
 
$
3,145

 
$
—

 
$
—

Intrinsic value vested
 
$
—

 
$
787

 
$
659

 
 
 
 
 
 
 
RSU
 
 
 
 
 
 
Shares granted
 
60,377

 
67,745

 
76,618

Grant date fair value per share
 
$
87.47

 
$
93.52

 
$
58.89

Grant date fair value
 
$
5,281

 
$
6,336

 
$
4,512

Intrinsic value vested
 
$
4,680

 
$
2,754

 
$
292
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, 2016.
 
 
 
Number of Units
 
Grant Date Fair Value Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value
Non-vested at December 31, 2015
 
113,649

 
$
78.84

 
 
 
 
Granted
 
96,747

 
$
87.09

 
 
 
 
Vested
 
(49,386
)
 
$
75.71

 
 
 
 
Forfeited
 
(1,571
)
 
$
92.53

 
 
 
 
Non-vested and expected to vest at December 31, 2016
 
159,439

 
$
84.68

 
1.1
 
$
23,493
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 2016, 2015 and 2014 purchase periods.


 
 
Year ended December 31,
 
 
2016
 
2015
 
2014
ESPP shares purchased by employees
 
31,227

 
34,299

 
47,466

Intrinsic value of ESPP purchases (in thousands)
 
$
955

 
$
1,382

 
$
476

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

 
0.5

 
0.5

Expected stock price volatility
 
32.5
%
 
27.0
%
 
20.8
%
Risk-free interest rate
 
0.3
%
 
0.6
%
 
1.1
%
Expected dividend yield
 
—
%
 
—
%
 
—
%