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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Common Stock
The following table shows the beginning and ending balances of our issued and outstanding common stock for the year ended December 31, 2019, 2018, and 2017:
 
Year Ended
December 31,
 
2019
2018
2017
Shares issued and outstanding, beginning balance
70,596,559

69,818,392

69,015,690

Issuance of common stock from vested restricted stock units
1,036,119

1,634,271

1,020,352

Issuance of common stock from exercise of stock options
187,504

617,157

1,441,957

Issuance of common stock for employee stock purchase plan
207,324

175,966

224,928

Repurchase of common stock
(2,510,376
)
(1,190,995
)
(1,549,434
)
Awards effectively repurchased for required employee withholding taxes
(451,639
)
(458,232
)
(335,101
)
Shares issued and outstanding, ending balance
69,065,491

70,596,559

69,818,392
Schedule of Stock Repurchase
The following table summarizes the share repurchases under this program for the years ended December 31, 2019, 2018 and 2017:
 
Year Ended
December 31,
(in millions, except per share data)
2019
2018
2017
Total cost
$
140

$
61

$
44

Total shares
2,510,376

1,190,995

1,549,434

Average price per share
$
55.64

$
51.22

$
34.46