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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Common Share Repurchases and Issuances | The following table summarizes common share repurchases and issuances.
|  | Three Months Ended March 31, |
|  | 2017 |  |  | 2016 |
Common shares repurchased(1) |  |  | 7,363,292 |  |  |  | 19,210,281 |
Average purchase price per share |  | $ | 14.95 |  |  | $ | 10.42 |
Shares repurchased related to employee stock-based compensation plans(2) |  |  | 1,354,280 |  |  |  | 986,273 |
Average purchase price per share |  | $ | 15.55 |  |  | $ | 9.96 |
Common shares issued(3) |  |  | 2,794,510 |  |  |  | 2,499,585 |
(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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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