Share-Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 8,465,000	$ 8,233,000	$ 7,790,000
Stock Options [Member]
Stock option activity [Roll Forward]
Beginning balance (in shares)	4,669,237
Granted (in shares)	280,746
Exercised (in shares)	986,110	958,509	650,210
Forfeited (in shares)	19,682
Ending balance (in shares)	3,944,191	4,669,237
Exercisable (In Shares)	2,090,468
Stock option weighted average exercise price [Abstract]
Beginning balance (in dollars per share)	$ 24.23
Granted (in dollars per share)	$ 37.13
Exercised (in dollars per share)	$ 19.49
Forfeited (in dollars per share)	$ 24.26
Ending balance (in dollars per share)	$ 26.33	$ 24.23
Exercisable at end of period (in dollars per share)	$ 28.89
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term of shares outstanding (in years)	5 years 1 month 27 days
Weighted average remaining contractual term of shares exercisable at end of period (in years)	3 years 5 months 15 days
Aggregate Intrinsic Value [Abstract]
Ending balance	63,069,781
Exercisable at end of period	28,091,967
Cash Proceeds and Tax Benefits [Abstract]
Exercised (in shares)	986,110	958,509	650,210
Cash proceeds	19,221,000	12,173,000	5,411,000
Intrinsic value of options exercised	19,383,000	13,868,000	8,589,000
Tax benefits realized	7,418,000	5,409,000	3,375,000
Grant Date Fair Value Assumptions [Abstract]
Expected volatility (in hundredths)	38.60%	37.90%	38.90%
Expected term (in years)	7 years 7 months 6 days	7 years 9 months 18 days	6 years 8 months 12 days
Risk-free interest rate (in hundredths)	1.61%	3.10%	3.23%
Expected dividend yield (in hundredths)	2.00%	2.00%	2.00%
Grant date fair value (in dollars per share)	$ 12.66	$ 8.97	$ 7.34
Share-based compensation	4,304,000	4,497,000	4,570,000
Recognized tax benefits	1,647,000	1,721,000	1,796,000
Unamortized compensation expense	3,500,000
Expense recognition over weighted average period (in years)	2 years 0 months 14 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	605,552
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	3,873,000	3,507,000	3,028,000
Unamortized compensation expense	3,100,000
Expense recognition over weighted average period (in years)	1 year 9 months 18 days
Restricted stock awards [Roll Forward]
Beginning balance (in shares)	505,290
Granted (at market price) (in shares)	87,476
Vested (in shares)	69,580	32,856	44,152
Forfeited (in shares)	7,000
Ending balance (in shares)	516,186	505,290
Restricted stock awards weighted average grant date fair value [Abstract]
Beginning balance (in dollars per share)	$ 22.37
Granted (at market price) (in dollars per share)	$ 37.13
Vested (in dollars per share)	$ 33.60
Forfeited (in dollars per share)	$ 22.53
Ending balance (in dollars per share)	$ 23.36	$ 22.37
Vested (in shares)	69,580	32,856	44,152
Fair value of restricted stock awards vested	2,338,000	812,000	1,077,000
ESPP Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under the ESPP (in shares)	31,275	37,653	48,002
Grant Date Fair Value of most recent ESPP Purchase (per share)	$ 7.16
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 300,000	$ 200,000	$ 200,000
LTIP 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares allocated for issuance (in shares)	5,415,000
Number of shares originally allocated for issuance (in shares)	1,515,000
Shares available for grant	1,965,169
LTIP 2002 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares allocated for issuance (in shares)	2,700,000
Number of shares originally allocated for issuance (in shares)	1,575,000
Director plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares allocated for issuance (in shares)	1,350,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares allocated for issuance (in shares)	956,250
Discounted percentage rate offered under the employee stock purchase plan (in hundredths)	85.00%

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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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

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

No definition available.

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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)

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 10

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- Definition

Tax benefits realized from the exercise of stock options resulting in reductions in the entity's income taxes, which increases net cash provided by operating activities.

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