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Stockholder's Equity (Summary Of Stock Option Plan Activity) (Details) - $ / shares | 12 Months Ended | 105 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016
Options Outstanding |  |  |  |
Granted (in shares) |  |  |  | 6,413,660
Outstanding as of End of Period (in shares) | 3,757,947 |  |  | 3,757,947
Exercisable (in shares) | 1,200,250 |  |  | 1,200,250
Stock Option Plan [Member] |  |  |  |
Options Outstanding |  |  |  |
Outstanding as of Beginning of Period (in shares) | 4,530,982 | 4,712,330 |  |
Granted (in shares) | 845,440 | 893,220 |  |
Exercised (in shares) | (1,180,242) | (813,838) |  |
Cancelled/Forfeited (in shares) | (438,233) | (260,730) |  |
Outstanding as of End of Period (in shares) | 3,757,947 | 4,530,982 | 4,712,330 | 3,757,947
Exercisable (in shares) | 1,200,250 | 1,792,242 |  | 1,200,250
Exercise Price |  |  |  |
Outstanding as of Beginning of Period (in dollars per share) | $ 41.49 | $ 38.52 |  |
Granted (in dollars per share) | 46.00 | 42.00 |  |
Exercised (in dollars per share) | 24.80 | 23.47 |  |
Cancelled/Forfeited (in dollars per share) | 49.49 | 45.84 |  |
Outstanding as of End of Period (in dollars per share) | 46.81 | 41.49 | $ 38.52 | $ 46.81
Exercisable (in dollars per share) | $ 45.93 | $ 31.00 |  | $ 45.93
Remaining Life |  |  |  |
Outstanding | 5 years 10 months 6 days | 4 years 10 months 20 days | 4 years 7 months 2 days |
Granted | 8 years 4 months 27 days | 8 years 4 months 27 days |  |
Exercisable | 3 years 8 months 27 days | 2 years 1 month 24 days |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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