XML 45 R30.htm IDEA: XBRL DOCUMENT v3.10.0.1
Share Based Award (Tables)
 12 Months Ended
Dec. 31, 2018
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)
 
2018
 
2017
 
2016
Stock compensation expense
 
$
24,241

 
$
19,352

 
$
15,242

Tax benefit from stock-based compensation cost
 
$
5,706

 
$
7,247

 
$
5,682

Indirect tax benefit
 
$
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,
 
 
2018
 
2017
 
2016
Number of time-based options granted
 
5,815

 
8,825

 
13,405

Grant date fair value of options granted (in thousands)
 
$
425

 
$
375

 
$
413

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

 
5.5

 
5.5

Expected stock price volatility
 
24.0
%
 
27.0
%
 
31.8
%
Risk-free interest rate
 
2.3
%
 
1.1
%
 
0.7
%
Expected dividend yield
 
—
%
 
—
%
 
—
%
Weighted average grant price per option
 
$
269.80

 
$
158.20

 
$
101.32

Weighted average grant date fair value per option
 
$
73.14

 
$
42.51

 
$
30.78
Schedule of Share-based compensation, performance stock option activity [Table Text Block]
The table below indicates the number of shares of 2015 performance stock options that were earned in 2016. There were no performance option grants to employees in 2018, 2017 or 2016.

 
 
Year ended December 31,
 
 
2018
 
2017
 
2016
Number of performance options earned
 

 

 
244,825
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, 2018 is as follows:
 
 
 
Shares
 
Weighted Average Exercise Price Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2017
 
1,416,727

 
$
62.30

 
 
 
 
Granted
 
5,815

 
$
269.80

 
 
 
 
Exercised
 
(235,614
)
 
$
60.60

 
 
 
 
Forfeited or expired
 
—

 
$
—

 
 
 
 
Outstanding at December 31, 2018
 
1,186,928

 
$
63.66

 
4.9
 
$
197,232

Exercisable at December 31, 2018
 
1,181,113

 
$
62.64

 
4.8
 
$
197,232

Vested and expected to vest, December 31, 2018
 
1,186,928

 
$
63.66

 
4.9
 
$
197,232
Exercised Options Data [Table Text Block]
The following table presents information regarding Stock Option activity:
 
 
 
Year ended December 31,
(In thousands)
 
2018
 
2017
 
2016
Intrinsic value of options exercised
 
$
51,105

 
$
71,283

 
$
25,065

Cash received from exercise of stock options
 
$
14,275

 
$
32,003

 
$
17,346

Tax benefit from stock option exercises
 
$
12,617

 
$
20,004

 
$
7,556
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)
 
2018
 
2017
 
2016
PRSU
 
 
 
 
 
 
Shares granted
 
30,348

 
20,686

 
36,370

Shares earned
 
—

 
—

 
—

Grant date fair value per share
 
$
248.65

 
$
154.75

 
$
86.47

Grant date fair value
 
$
7,546

 
$
3,201

 
$
3,145

Intrinsic value vested
 
$
—

 
$
—

 
$
—

 
 
 
 
 
 
 
RSU
 
 
 
 
 
 
Shares granted
 
63,094

 
107,678

 
60,377

Grant date fair value per share
 
$
252.42

 
$
156.49

 
$
87.47

Grant date fair value
 
$
15,926

 
$
16,851

 
$
5,281

Intrinsic value vested
 
$
17,086

 
$
9,813

 
$
4,680
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, 2018.
 
 
 
Number of Units
 
Grant Date Fair Value Per Share
 
Weighted Average Contractual Life (Years)
 
Aggregate Intrinsic Value
Non-vested at December 31, 2017
 
285,503

 
$
116.28

 
 
 
 
Change in units due to performance expectations (a)
 
41,372

 
$
154.75

 
 
 
 
Granted
 
93,442

 
$
251.19

 
 
 
 
Vested
 
(71,868
)
 
$
122.00

 
 
 
 
Forfeited
 
(7,745
)
 
$
181.07

 
 
 
 
Non-vested and expected to vest at December 31, 2018
 
340,704

 
$
155.27

 
1.0
 
$
78,236
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 and 2016 purchase periods.
 
 
 
 
2017
 
2016
ESPP shares purchased by employees
 
23,426

 
31,227

Intrinsic value of ESPP purchases (in thousands)
 
$
986

 
$
955

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

 
0.5

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