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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity [Abstract] |
Common Share Repurchases and Issuances | The following table summarizes common share repurchases and issuances.
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Common stock repurchased(1) |  |  | 9,617,008 |  |  |  | — |  |  |  | 19,034,252 |  |  |  | — |
Average purchase price per share |  | $ | 13.06 |  |  | $ | — |  |  | $ | 12.24 |  |  | $ | — |
Shares repurchased related to employee stock- based compensation plans(2) |  |  | 120,485 |  |  |  | 92,369 |  |  |  | 2,534,090 |  |  |  | 3,557,504 |
Average purchase price per share |  | $ | 13.45 |  |  | $ | 14.53 |  |  | $ | 10.94 |  |  | $ | 13.77 |
Common shares issued(3) |  |  | 195,883 |  |  |  | 113,171 |  |  |  | 4,625,347 |  |  |  | 5,134,238 |
(1) | Common shares purchased under our share repurchase program.
(2) | Comprises 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.
(3) | 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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