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Share Based Award (Tables)
 12 Months Ended
Dec. 31, 2015
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 for the years ended December 31, 2015, 2014 and 2013.
 
 
Year ended December 31,
 (In thousands)
 
2015
 
2014
 
2013
Stock compensation expense
 
$
12,827

 
$
9,592

 
$
5,434

Tax benefit from stock-based compensation cost
 
$
4,922

 
$
3,567

 
$
2,052

Indirect tax benefit
 
$
1,997

 
$
209

 
$
866
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 for the years ended December 31, 2015, 2014 and 2013.
 
 
Year ended December 31,
 
 
2015
 
2014
 
2013
Number of time-based options granted
 
22,816

 
492,935

 
244,440

Grant date fair value of options granted (in thousands)
 
$
590

 
$
7,311

 
$
3,934

Weighted average assumptions for stock option valuation:
 
 
 
 
 
 
Expected term (years)
 
5.6

 
4.7

 
4.6

Expected stock price volatility
 
25.9
%
 
26.7
%
 
29.2
%
Risk-free interest rate
 
1.7
%
 
1.4
%
 
0.8
%
Expected dividend yield
 
—
%
 
—
%
 
—
%
Weighted average grant price per option
 
$
93.30

 
$
58.92

 
$
62.12

Weighted average grant date fair value per option
 
$
25.86

 
$
14.83

 
$
16.09
Schedule of Share-based compensation, performance stock option activity [Table Text Block]
The table below summarizes the performance stock options granted, total valuation and the weighted average assumptions for the years ended December 31, 2015 and 2014.

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

 
699,625

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, 2015 is as follows:
 
 
 
Shares
 
Weighted Average Exercise Price Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2014
 
2,556,936

 
$
49.46

 
 
 
 
Granted
 
267,641

 
$
92.00

 
 
 
 
Exercised
 
(435,146
)
 
$
34.77

 
 
 
 
Forfeited or expired
 
(10,024
)
 
$
58.20

 
 
 
 
Outstanding at December 31, 2015
 
2,379,407

 
$
56.90

 
7.1
 
$
132,963

Exercisable at December 31, 2015
 
1,287,271

 
$
48.45

 
5.9
 
$
82,809

Vested and expected to vest, December 31, 2015
 
2,379,407

 
$
56.90

 
7.1
 
$
132,963
Exercised Options Data [Table Text Block]
 
 
 
Year ended December 31,
(In thousands)
 
2015
 
2014
 
2013
Intrinsic value of options exercised
 
$
28,071

 
$
18,802

 
$
21,847

Cash received from exercise of stock options
 
$
15,042

 
$
16,998

 
$
18,004

Tax benefit from stock option exercises
 
$
9,330

 
$
5,700

 
$
6,966
Schedule of restricted stock activity [Table Text Block]
The table below summarizes our restricted stock award activity for the years ended December 31, 2015, 2014 and 2013.
 
 
Year ended December 31,
(In thousands except shares and per share amounts)
 
2015
 
2014
 
2013
PRSU
 
 
 
 
 
 
Shares granted
 
—

 
—

 
15,085

Grant date fair value per share
 
$
—

 
$
—

 
$
50.82

Grant date fair value
 
$
—

 
$
—

 
$
767

Intrinsic value vested
 
$
787

 
$
659

 
$
636

 
 
 
 
 
 
 
RSU
 
 
 
 
 
 
Shares granted
 
67,745

 
76,618

 
4,908

Grant date fair value per share
 
$
93.52

 
$
58.89

 
$
67.25

Grant date fair value
 
$
6,336

 
$
4,512

 
$
330

Intrinsic value vested
 
$
2,754

 
$
292

 
$
412
Schedule of Share-based Compensation, Restricted Stock Units Award 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, 2015.
 
 
 
Number of Units
 
Grant Date Fair Value Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value
Non-vested at December 31, 2014
 
86,032

 
$
57.22

 
 
 
 
Granted
 
67,745

 
$
93.52

 
 
 
 
Vested
 
(39,507
)
 
$
56.79

 
 
 
 
Forfeited
 
(621
)
 
$
88.76

 
 
 
 
Non-vested and expected to vest at December 31, 2015
 
113,649

 
$
78.84

 
1.0
 
$
12,817
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 2015, 2014 and 2013 purchase periods.
 
 
Year ended December 31,
 
 
2015
 
2014
 
2013
ESPP shares purchased by employees
 
34,299

 
47,466

 
50,944

Intrinsic value of ESPP purchases (in thousands)
 
$
1,382

 
$
476

 
$
840

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

 
0.5

 
0.5

Expected stock price volatility
 
27.0
%
 
20.8
%
 
24.4
%
Risk-free interest rate
 
0.6
%
 
1.1
%
 
0.1
%
Expected dividend yield
 
—
%
 
—
%
 
—
%