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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 72 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2012 Stock Options Plans [Member] | Dec. 31, 2011 Stock Options Plans [Member] | Dec. 31, 2010 Stock Options Plans [Member] | Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2010 Restricted Stock Units (RSUs) [Member] | May 16, 2007 2012 Long-term Incentive Plan [Member] Maximum [Member] | Dec. 31, 2012 2007 Incentive Plan [Member] | May 09, 2012 2007 Incentive Plan [Member] | Dec. 31, 2012 2007 Incentive Plan [Member] Maximum [Member] Stock Options Plans [Member] | Dec. 31, 2012 2007 Incentive Plan [Member] Maximum [Member] Restricted Stock Units (RSUs) [Member] | Dec. 31, 2012 2007 Incentive Plan [Member] Minimum [Member] Stock Options Plans [Member] | Dec. 31, 2012 2007 Incentive Plan [Member] Minimum [Member] Restricted Stock Units (RSUs) [Member] | Dec. 31, 2012 Treasury Stock [Member] | Dec. 31, 2011 Treasury Stock [Member] | Dec. 31, 2010 Treasury Stock [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock reserved for issuance |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  | 3,200,000 |  |  |  |  |  |  |
Expiration year |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2007 |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years | 3 years | 3 years |  |  |
Option awards contractual term (years) |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Weighted average remaining life | 3 years 10 months 24 days |  |  |  | 1 year 4 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock to non-employee directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 | 3,000 | 4,000
Stock repurchase program authorized share amount | 15,000,000 |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased, shares |  |  | 6,000 | 11,518,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased price per share |  |  | $ 56.94 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased, value |  |  |  | $ 335,110 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value of options granted | $ 28.71 | $ 25.39 | $ 19.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised | 4,226 | 1,148 | 1,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized stock-based compensation costs |  |  |  |  | 2,176 | 1,885 | 2,436 | 11,887 | 8,186 | 4,262 |  |  |  |  |  |  |  |  |  |
Recognized stock-based compensation costs, net of tax |  |  |  |  | 1,378 | 1,194 | 1,543 | 7,530 | 5,186 | 2,700 |  |  |  |  |  |  |  |  |  |
Pre-tax unrecognized compensation expense | $ 15,437 |  |  | $ 15,437 | $ 2,096 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized expense over a weighted-average period, years | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + 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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