XML 56 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Unit Activity
Restricted stock unit activity is summarized as follows:
 
Number of Shares Outstanding

Weighted Average Grant Date Fair Value per Share

Weighted Average Remaining Contractual Life (Years)

Aggregate Intrinsic Value (1) (Dollars in Thousands)
Restricted stock units outstanding, December 31, 2015
1,416,438


$
148.53






Restricted stock units granted
720,601


309.18






Additional shares granted due to special distribution
37


297.03






Restricted stock units released, vested
(655,584
)

213.72






Special distribution shares released
(35,354
)

269.94






Restricted stock units canceled
(93,940
)

242.41






Special distribution shares canceled
(4,319
)

272.84






Restricted stock units outstanding, December 31, 2016
1,347,879


192.59






Restricted stock units granted
658,196


389.60






Restricted stock units released, vested
(606,064
)

260.75






Special distribution shares released
(15,667
)

243.06






Restricted stock units canceled
(79,451
)

313.83






Special distribution shares canceled
(1,002
)

282.49






Restricted stock units outstanding, December 31, 2017
1,303,891


252.30






Restricted stock units granted
704,249


387.31






Restricted stock units released, vested
(593,528
)

299.07






Special distribution shares released
(13,880
)

283.14






Restricted stock units canceled
(173,460
)

336.75






Special distribution shares canceled
(485
)

295.77






Restricted stock units outstanding, December 31, 2018
1,226,787


$
361.22


1.24

$
432,516

 
(1) 
The intrinsic value is calculated based on the market value of the stock as of December 31, 2018.
Disclosures for 2004 Purchase Plan
The Company provides the following disclosures for the 2004 Purchase Plan as of December 31 (dollars, except shares):
 
2018
 
2017
 
2016
Weighted-average purchase price per share
$
341.48

 
$
250.65

 
$
217.91

Weighted average grant-date fair value per share of shares purchased
$
90.04

 
$
72.21

 
$
60.49

Number of shares purchased
145,346

 
162,076

 
150,044
Assumptions in Computation of Fair Value
The Company uses the Black-Scholes option-pricing model to determine the fair value of shares under the 2004 Purchase Plan with the following assumptions during the years ended December 31:
 
2018
 
2017
 
2016
Range of dividend yield
1.97 - 2.00%

 
2.10 - 2.31%

 
2.38 - 2.53%

Range of risk-free interest rate
1.79 - 2.68%

 
0.70 - 1.35%

 
0.48 - 0.76%

Range of expected volatility
19.04 - 24.33%

 
16.42 - 24.27%

 
18.80 - 30.94%

Weighted-average expected volatility
20.74
%
 
20.30
%
 
25.01
%
Weighted average expected life (in years)
1.43

 
1.52

 
1.41
Schedule of Allocated Share-based Compensation
The following table presents, by operating expense, the Company's stock-based compensation expense recognized in the Company's consolidated statement of operations for the years ended December 31 (in thousands):
 
2018
 
2017
 
2016
Cost of revenues
$
18,247

 
$
13,621

 
$
13,086

Sales and marketing
53,448

 
50,094

 
43,030

General and administrative
109,021

 
111,785

 
100,032

Total
$
180,716

 
$
175,500

 
$
156,148
Schedule of Share-based Compensation by Plan
The Company's stock-based compensation recognized in the consolidated statement of operations was comprised of the following types of equity awards for the years ended December 31 (in thousands):
 
2018
 
2017
 
2016
Restricted stock units
$
165,141

 
$
164,321

 
$
145,769

Employee stock purchase plan
15,575

 
11,179

 
10,379

Total
$
180,716

 
$
175,500

 
$
156,148