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Common Stock (Schedule Of Weighted Average Remaining Contractual Life For Options Outstanding And Weighted Average Exercise Price Per Share For Exercisable Options) (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options Outstanding, Shares | 7,558,945 |  | 6,594,950 | 8,802,450 | 8,116,326
Options Outstanding, Weighted Average Exercise Price Per Share | $ 31.63 |  | $ 25.16 | $ 25.03 | $ 22.68
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) | 2.8 |  |  |  |
Exercisable Options, Shares | 2,979,945 |  |  |  |
Weighted average exercise price per share, Options Exercisable | $ 23.82 |  |  |  |
Expected to Vest Options , Shares | 4,160,480 | [1] |  |  |
Expected to Vest Options, Weighted Average Exercise Price Per Share | $ 36.71 | [1] |  |  |
Weighted average forfeiture rate | 9.14% |  |  |  |
$16.22 - $24.45 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options Outstanding, Shares | 2,642,825 |  |  |  |
Options Outstanding, Weighted Average Exercise Price Per Share | $ 19.56 |  |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) | 1.5 |  |  |  |
Exercisable Options, Shares | 2,050,825 |  |  |  |
Weighted average exercise price per share, Options Exercisable | $ 20.53 |  |  |  |
Expected to Vest Options , Shares | 537,891 | [1] |  |  |
Expected to Vest Options, Weighted Average Exercise Price Per Share | $ 16.22 | [1] |  |  |
Range, Low | $ 16.22 |  |  |  |
Range, High | $ 24.45 |  |  |  |
$25.32 - $29.26 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options Outstanding, Shares | 29,500 |  |  |  |
Options Outstanding, Weighted Average Exercise Price Per Share | $ 26.80 |  |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) | 1.1 |  |  |  |
Exercisable Options, Shares | 17,750 |  |  |  |
Weighted average exercise price per share, Options Exercisable | $ 26.59 |  |  |  |
Expected to Vest Options , Shares | 10,676 | [1] |  |  |
Expected to Vest Options, Weighted Average Exercise Price Per Share | $ 27.12 | [1] |  |  |
Range, Low | $ 25.32 |  |  |  |
Range, High | $ 29.26 |  |  |  |
$29.60 - $32.28 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options Outstanding, Shares | 2,139,120 |  |  |  |
Options Outstanding, Weighted Average Exercise Price Per Share | $ 31.15 |  |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) | 2.9 |  |  |  |
Exercisable Options, Shares | 911,370 |  |  |  |
Weighted average exercise price per share, Options Exercisable | $ 31.16 |  |  |  |
Expected to Vest Options , Shares | 1,115,534 | [1] |  |  |
Expected to Vest Options, Weighted Average Exercise Price Per Share | $ 31.14 | [1] |  |  |
Range, Low | $ 29.60 |  |  |  |
Range, High | $ 32.28 |  |  |  |
$38.12 - $43.67 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options Outstanding, Shares | 2,728,000 |  |  |  |
Options Outstanding, Weighted Average Exercise Price Per Share | $ 43.59 |  |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) | 4.1 |  |  |  |
Expected to Vest Options , Shares | 2,478,661 | [1] |  |  |
Expected to Vest Options, Weighted Average Exercise Price Per Share | $ 43.59 | [1] |  |  |
Range, Low | $ 38.12 |  |  |  |
Range, High | $ 43.67 |  |  |  |
$46.79 - $54.79 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options Outstanding, Shares | 19,500 |  |  |  |
Options Outstanding, Weighted Average Exercise Price Per Share | $ 52.99 |  |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) | 4.3 |  |  |  |
Expected to Vest Options , Shares | 17,718 | [1] |  |  |
Expected to Vest Options, Weighted Average Exercise Price Per Share | $ 52.99 | [1] |  |  |
Range, Low | $ 46.79 |  |  |  |
Range, High | $ 54.79 |  |  |  |
[1] | Assumes a weighted average forfeiture rate of 9.14%.

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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -SubTopic 10 -Topic 718 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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