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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Schedule of common share repurchases | The following table summarizes our common share repurchases and issuances.
|  | Three Months Ended March 31,
(Shares and per share amounts in actuals) |  | 2019 |  | 2018
Common stock repurchased under repurchase program(1) |  | 5,435,476 |  |  | — |
Average purchase price per share(2) |  | $ | 11.04 |  |  | $ | — |
Shares repurchased related to employee stock-based compensation plans(3) |  | 1,289,391 |  |  | 2,740,018 |
Average purchase price per share |  | $ | 10.95 |  |  | $ | 11.31 |
Common shares issued(4) |  | 3,470,664 |  |  | 5,559,991 |
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(1) | Common shares purchased under our share repurchase program, of which $140 million remained available as of March 31, 2019.
(2) | Average purchase price per share includes purchase commission costs.
(3) | Comprised of shares withheld from stock option exercises and vesting of restricted stock for employees’ tax withholding obligations and shares tendered by employees to satisfy option exercise costs.
(4) | Common shares issued under our various compensation and benefit plans.

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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