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Stockholders' Equity and Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2017
Summary of Nonvested Restricted Stock Awards Activity

The following table summarizes restricted stock awards activity for the year ended December 31, 2017:

 

 

Time-Based Restricted Stock Awards

 

 

Market-Based Restricted Stock Awards

 

 

Shares

 

 

Weighted Average Grant Date Fair Value

 

 

Shares

 

 

Weighted Average Grant Date Fair Value

 

Unvested shares of restricted stock

  outstanding at December 31, 2016

 

1,429,514

 

 

$

20.56

 

 

 

738,425

 

 

$

28.68

 

  Granted

 

309,526

 

 

$

60.00

 

 

 

314,021

 

 

$

48.63

 

  Vested

 

(681,699

)

 

$

6.67

 

 

 

(1,014,429

)

 

$

34.44

 

  Forfeited

 

(168,661

)

 

$

35.20

 

 

 

(38,017

)

 

$

39.87

 

Unvested shares of restricted stock

  outstanding at December 31, 2017

 

888,680

 

 

$

42.17

 

 

 

-

 

 

$

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Non-cash Stock-based Compensation Resulting From Restricted Stock Awards

The following table presents non-cash stock-based compensation expense resulting from restricted stock awards, which is included in the following line items in the accompanying consolidated statements of income for the years ended December 31, 2017, 2016 and 2015 (dollars in thousands):

 

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

Operating expense

 

$

3,950

 

 

$

2,217

 

 

$

235

 

Sales and marketing

 

 

6,086

 

 

 

3,656

 

 

 

559

 

Research and development

 

 

1,912

 

 

 

836

 

 

 

104

 

General and administrative

 

 

26,565

 

 

 

15,837

 

 

 

2,112

 

Total non-cash stock-based compensation expense

 

$

38,513

 

 

$

22,546

 

 

$

3,010

 

 

Restricted Stock [Member]  
Summary of Grant-Date Fair Values of Restricted Stock Granted and Related Assumptions

The following table presents a summary of the grant-date fair values of restricted stock granted during the years ended December 31, 2017, 2016 and 2015 and the related assumptions:

 

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

Grant-date fair value of restricted stock

 

$46.78 - $60.67

 

 

$23.15 - $49.34

 

 

$21.76 - $33.33

 

Risk-free interest rates

 

1.85%

 

 

1.28% - 1.36%

 

 

2.2%

 

Estimated volatility

 

23.0%

 

 

21.0% - 23.0%

 

 

26.0%

 

Expected life (in years)

 

 

2.3

 

 

 

2.7

 

 

 

3.6

 

 

Market-based Restricted Stock [Member]  
Summary of Market-based Restricted Stock Vesting Activity

The following table summarizes market-based restricted stock vesting activity during the year ended December 31, 2017, the associated compensation cost recognized in connection with the vesting event and the number of shares withheld to satisfy tax withholding obligations:

 

Vesting Condition

Date Vested

 

Number of Shares Vested

 

 

Compensation Cost Recognized Upon Vesting (in millions)

 

Shares Withheld for Taxes1

 

Market-based (TEV = $3.5 billion)

May 13, 2017

 

 

229,075

 

 

$2.9

 

 

91,274

 

Market-based (TEV = $3.9 billion)

June 20, 2017

 

 

248,250

 

 

$5.2

 

 

103,907

 

Market-based (TEV = $4.15 billion)

August 25, 2017

 

 

153,764

 

 

$5.5

 

 

65,309

 

Market-based (TEV = $4.2 billion)

September 7, 2017

 

 

244,850

 

 

$4.2

 

 

102,548

 

Market-based (TEV = $4.45 billion)

October 13, 2017

 

 

138,490

 

 

$4.3

 

 

57,916