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Stockholders' Equity - (Tables)
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Schedule of Common Stock
The following table presents a rollforward of our common stock for the three and six months ended June 30, 2020 and 2019:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2020
2019
2020
2019
Shares issued and outstanding, beginning balance
68,470,050

70,079,747


69,065,491

70,596,559

Issuance of common stock from vested restricted stock units
168,621

213,991


342,250

500,710

Issuance of common stock from exercise of stock options
11,136

58,491


40,609

139,773

Issuance of common stock for employee stock purchase plan
130,532

112,623


130,532

112,623

Repurchase of common stock
(1,419,984
)
(392,700
)

(2,167,401
)
(1,175,609
)
Awards effectively repurchased for required employee withholding taxes
(67,491
)
(81,007
)

(118,617
)
(182,911
)
Shares issued and outstanding, ending balance
67,292,864

69,991,145


67,292,864

69,991,145