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Shareholders' Equity (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Interim Cash Dividends [Member] | Jun. 30, 2012 Interim Cash Dividends [Member] | Dec. 31, 2012 Final Cash Dividends [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 2007 Plan [Member] plans | Dec. 31, 2012 1998 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of active equity compensation plans |  |  |  |  |  |  |  |  |  | 1 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 2,569,000 | 2,569,000 |  |  |  |  |  |  |  | 20,000,000 | 0
Vesting Rate When Specified Diluted Earnings Per Share Targets are Achieved |  |  |  |  |  |  |  |  |  | 50.00% |
Vesting Rate Higher Specified Diluted Earnings Per Share Targets are Achieved |  |  |  |  |  |  |  |  |  | 50.00% |
Stock options granted prior to 2006, vesting period, years |  | 7 years |  |  |  |  |  |  |  |  |
Option pricing model used to determine fair value of stock options |  | Black-Scholes |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  | $ 6.73 | $ 5.70 | $ 9.65 |  |  |  |  |  |  |
Change in management estimate of stock based compensation expense amortization |  |  |  | $ 11,663,000 |  |  |  |  |  |  |
Previously recognized stock-based compensation costs reversed |  |  |  | 6,375,000 |  |  |  |  |  |  |
Unrecognized compensation cost | 50,264,000 | 50,264,000 |  | 27,460,000 |  |  |  |  |  |  |
Total options that were exercisable | 9,760,000 | 9,760,000 | 11,680,000 | 14,247,000 |  |  |  |  |  |  |
Expiration date for options outstanding |  |  |  |  |  |  |  | Dec. 16, 2013 | Dec. 11, 2022 |  |
Options outstanding weighted average remaining contractual life, years |  | 5 years 10 months 24 days |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  | 19,565,000 | 8,642,000 |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable | 51,087,000 | 51,087,000 |  |  |  |  |  |  |  |  |
Total intrinsic value of options outstanding | 64,823,000 | 64,823,000 |  |  |  |  |  |  |  |  |
Share Price | $ 23.34 | $ 23.34 |  |  |  |  |  |  |  |  |
Employee stock purchase plan, employee eligible percentage on offerings of common stock |  | 85.00% |  |  |  |  |  |  |  |  |
Shares reserved under the plan | 15,600,000 | 15,600,000 |  |  |  |  |  |  |  |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 11,580,000 |  |  |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP), Compensation Expense |  | 0 | 0 | 0 |  |  |  |  |  |  |
Remaining stock repurchase authorization amount | 91,012,000 |  |  |  |  |  |  |  |  |  |
Rights received by common shareholder for each common share outstanding, rights | 1 | 1 |  |  |  |  |  |  |  |  |
Series A Junior Participating Preferred stock, par value | $ 0.05 | $ 0.05 | $ 0.05 |  |  |  |  |  |  |  |
Securities and assets of equivalent value, purchase price, per unit | $ 150.00 | $ 150.00 |  |  |  |  |  |  |  |  |
Number of days, rights become exercisable following public announcement |  | 10 |  |  |  |  |  |  |  |  |
Acquiring Person, beneficial ownership of the outstanding common stock, minimum percentage | 20.00% | 20.00% |  |  |  |  |  |  |  |  |
Holders, other than an acquiring person, right to purchase of common stock upon exercise of rights |  | twice |  |  |  |  |  |  |  |  |
Common shares received by holders upon surrender of rights, percentage |  | 50.00% |  |  |  |  |  |  |  |  |
Rights non-voting, redeemable days |  | 0 years 0 months 10 days |  |  |  |  |  |  |  |  |
Right redeemable price, per right | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.63 | $ 0.27 | $ 0.20 | $ 0.16 | $ 0.15 | $ 0.32 |  |  |  |
Dividends, Common Stock |  | $ 108,817,000 | $ 48,558,000 | $ 37,513,000 |  |  |  |  |  |  |

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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + 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 (f)(1) -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 e(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. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the 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 (d)(2) -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 c(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. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding. + References Reference 1: 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 Reference 2: 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. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 5 -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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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