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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2016
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, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Common shares repurchased(1) |  |  | 13,579,381 |  |  |  | 15,190,685 |  |  |  | 32,789,662 |  |  |  | 29,844,520 |
Average purchase price per share |  | $ | 12.90 |  |  | $ | 19.76 |  |  | $ | 11.45 |  |  | $ | 20.12 |
Shares repurchased related to employee stock-based compensation plans(2) |  |  | 368,439 |  |  |  | 431,168 |  |  |  | 1,354,712 |  |  |  | 2,075,932 |
Average purchase price per share |  | $ | 13.05 |  |  | $ | 19.83 |  |  | $ | 10.80 |  |  | $ | 20.65 |
Common shares issued(3) |  |  | 467,007 |  |  |  | 633,170 |  |  |  | 2,966,592 |  |  |  | 4,218,408 |
(1) | Common shares purchased under our share repurchase programs.
(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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