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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Schedule of common share repurchases | The following table summarizes our common share repurchases and issuances.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(Shares and per share amounts in actuals) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Shares repurchased related to employee stock-based compensation plans(1)(2) |  | 81,817 |  |  | 371,165 |  |  | 2,666,781 |  |  | 1,763,092 |
Average purchase price per share |  | $ | 10.93 |  |  | $ | 7.22 |  |  | $ | 12.09 |  |  | $ | 6.35 |
Common shares issued(3) |  | 423,112 |  |  | 561,100 |  |  | 5,652,886 |  |  | 3,727,574 |
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(1) | 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.
(2) | At the present time, we do not intend to initiate a publicly announced share repurchase program.
(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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