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Stockholders' Equity Stockholders' Equity (Summary of Options) (Details) - $ / shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,848 |  |
Common Stock, Capital Shares Reserved for Future Issuance | 2,801 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Outstanding at beginning of period (in shares) | 1,523 | 1,934 | 1,650
Granted (in shares) | 100 | 213 | 462
Exercised (in shares) | (247) | (459) | (159)
Canceled or expired (in shares) | (298) | (165) | (19)
Outstanding at end of year (in shares) | 1,078 | 1,523 | 1,934
Exercisable at end of year (in shares) | 643 | 1,001 | 1,225
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |
Outstanding at beginning of period (in usd per share) | $ 21.95 | $ 20.85 | $ 19.18
Granted (in usd per share) | 24.35 | 25.43 | 26.56
Exercised (in usd per share) | 17.37 | 17.73 | 19.81
Canceled or expired (in usd per share) | 21.96 | 25.34 | 23.17
Outstanding at end of year (in usd per share) | 23.22 | 21.95 | 20.85
Exercisable at end of year (in usd per share) | $ 22.02 | $ 20.29 | $ 18.68
Amended And Restated 2006 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 0 |  |
Common Stock, Capital Shares Reserved for Future Issuance | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Outstanding at end of year (in shares) | 844 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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