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Common Stock (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Nov. 30, 2009 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Class B Common [Member] | Dec. 31, 2011 Outstanding Stock Options [Member] | Dec. 31, 2010 Outstanding Stock Options [Member] | Dec. 31, 2009 Outstanding Stock Options [Member] | Dec. 31, 2011 Restricted Stock [Member] | Dec. 31, 2010 Restricted Stock [Member] | Dec. 31, 2009 Restricted Stock [Member] | Dec. 31, 2011 Amended And Restated 1992 Stock Option Plan [Member] | Dec. 31, 2011 Stock Incentive Plan [Member] | Dec. 31, 2010 Stock Incentive Plan [Member] | Dec. 31, 2009 Stock Incentive Plan [Member] | Dec. 31, 2011 Stock Incentive Plan [Member] Class B Common [Member] | Dec. 31, 2011 2001 Plan [Member] | Dec. 31, 2010 2001 Plan [Member] | Dec. 31, 2009 2001 Plan [Member] | Dec. 31, 2010 2001 Plan [Member] Class B Common [Member] | Dec. 31, 2011 2010 Plan [Member] | Dec. 31, 2011 Employee Stock Purchase Plan [Member] | Dec. 31, 2010 Employee Stock Purchase Plan [Member] | Dec. 31, 2009 Employee Stock Purchase Plan [Member] | Dec. 31, 2011 Long-Term Incentive Plans [Member] | Dec. 31, 2010 Long-Term Incentive Plans [Member] | Dec. 31, 2009 Long-Term Incentive Plans [Member] | Dec. 31, 2011 Chief Executive Officer ("CEO") And Chairman Of The Board [Member] | Dec. 31, 2011 Chief Executive Officer ("CEO") And Chairman Of The Board [Member] Class B Common Stock 2010 [Member] | Dec. 31, 2010 Chief Executive Officer ("CEO") And Chairman Of The Board [Member] Class B Common Stock 2010 [Member] | Mar. 31, 2010 Chief Executive Officer ("CEO") And Chairman Of The Board [Member] Class B Common Stock 2010 [Member] | Dec. 31, 2011 Chief Executive Officer [Member] Class B Common Stock 2009 [Member] | Dec. 31, 2010 Chief Executive Officer [Member] Class B Common Stock 2009 [Member] | Dec. 31, 2009 Chief Executive Officer [Member] Class B Common Stock 2009 [Member] | Mar. 31, 2009 Chief Executive Officer [Member] Class B Common Stock 2009 [Member] | Dec. 31, 2011 Chief Executive Officer [Member] Class B Common Stock 2008 [Member] | Dec. 31, 2010 Chief Executive Officer [Member] Class B Common Stock 2008 [Member] | Dec. 31, 2009 Chief Executive Officer [Member] Class B Common Stock 2008 [Member] | Mar. 31, 2008 Chief Executive Officer [Member] Class B Common Stock 2008 [Member] | Dec. 31, 2011 Chief Executive Officer [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2010 Chief Executive Officer [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2009 Chief Executive Officer [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2008 Chief Executive Officer [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2007 Chief Executive Officer [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2011 Various Employees [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2010 Various Employees [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2009 Various Employees [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2007 Various Employees [Member] Class B Common Stock 2007 [Member] | Dec. 31, 2010 Various Officers And Employees [Member] Class B Common Stock 2006 [Member] | Dec. 31, 2009 Various Officers And Employees [Member] Class B Common Stock 2006 [Member] | Dec. 31, 2006 Various Officers And Employees [Member] Class B Common Stock 2006 [Member]
Percentage of stock dividend | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid, per share |  |  |  |  |  |  |  |  |  | $ 0.20 | $ 0.2 | $ 0.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid |  |  |  |  |  |  |  |  |  | $ 19,000,000 | $ 19,000,000 | $ 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase programs authorized to purchase, shares |  | 10,000,000 |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefit |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost recognized |  |  |  |  |  |  |  |  |  | 18,200,000 | 16,800,000 | 13,100,000 |  | 15,800,000 | 13,300,000 | 9,900,000 | 2,000,000 | 3,100,000 | 2,800,000 |  |  |  |  |  |  |  |  |  | 198,000 | 461,000 | 339,000 | 316,000 | 2,400,000 | 3,500,000 | 3,200,000 |  | 375,000 | 355,000 |  | 556,000 | 556,000 | 482,000 |  | 375,000 | 375,000 | 375,000 |  | 333,000 | 375,000 |  |  |  | 120,000 | 135,000 | 135,000 |  | 1,300,000 | 1,500,000 |
Compensation cost recognized, pre-tax charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,800,000 | 13,300,000 | 9,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost recognized, after-tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,800,000 | 8,300,000 | 6,200,000 | 1,200,000 | 2,000,000 | 1,800,000 |  |  |  |  |  |  |  |  |  | 947,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation plans expired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | July of 2005 |  |  |  |  |  | March, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings per share diluted |  | $ 0.98 | $ 0.86 | $ 1.04 | $ 1.15 | $ 0.38 | $ 0.57 | $ 0.67 | $ 0.73 | $ 4.04 | $ 2.34 | $ 2.64 |  | $ 0.10 | $ 0.08 | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  |  |  | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted during period (net of cancellations) |  |  |  |  |  |  |  |  |  | 2,894,500 | 94,000 | 2,635,000 |  |  |  |  |  |  |  |  | 2,747,500 | 82,750 | 2,400,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of option granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.62 | $ 7.84 | $ 7.93 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of discount provided to eligible employees for purchase of shares under employee stock purchase plan |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,366 | 94,955 | 138,870 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, net of cancellations |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fully vested shares |  |  |  |  |  |  |  |  |  | 1,757,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,133 | 313,770 | 31,638 |  |  |  |  |  |  |  |  | 12,368 |  |  |  | 27,462 | 27,463 |  |  | 15,546 | 15,548 | 15,548 |  | 15,341 | 15,341 | 15,340 | 15,340 |  |  |  |  |  |  |  |
Issuance of restricted shares approved, shares |  |  |  |  |  |  |  |  |  |  |  |  | 21,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,472 |  |  |  | 109,850 |  |  |  | 62,190 |  |  |  |  | 61,362 |  |  |  | 22,250 |  |  | 247,000
Restricted shares price, per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 53.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.32 |  |  |  | $ 20.26 |  |  |  | $ 24.12 |  |  |  |  | $ 24.45 |  |  |  | $ 29.62 |  |  | $ 25.71
Issuance of restricted shares, value |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  | 2,200,000 |  |  |  | 1,500,000 |  |  |  |  | 1,500,000 |  |  |  | 659,000 |  |  | 6,400,000
Estimated compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 770,000 |  |  | 630,000 |  |  |  | 15,000 |  |  |  |  |  |  |  |  | 42,000 |  |  |  |  |  |
Total in-the-money value of all stock options exercised during the year |  |  |  |  |  |  |  |  |  | $ 28,900,000 | $ 26,800,000 | $ 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance upon conversion of shares |  |  |  |  |  |  |  |  |  |  |  |  | 31,167,268 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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(2)(d) -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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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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