Share-Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 9,065,000us-gaap_ShareBasedCompensation	$ 8,150,000us-gaap_ShareBasedCompensation	$ 8,465,000us-gaap_ShareBasedCompensation
Stock Options [Member]
Stock option activity [Roll Forward]
Beginning balance (in shares)	3,393,281
Granted (in shares)	170,725
Exercised (in shares)	441,833	780,485	986,110
Forfeited (in shares)	10,075
Ending balance (in shares)	3,112,098	3,393,281
Exercisable (In Shares)	1,994,947
Stock option weighted average exercise price [Abstract]
Beginning balance (in dollars per share)	$ 27.74
Granted (in dollars per share)	$ 58.24
Exercised (in dollars per share)	$ 28.18
Forfeited (in dollars per share)	$ 30.64
Ending balance (in dollars per share)	$ 29.35	$ 27.74
Exercisable at end of period (in dollars per share)	$ 25.51
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term of shares outstanding (in years)	4 years 8 months 15 days
Weighted average remaining contractual term of shares exercisable at end of period (in years)	3 years 4 months 25 days
Aggregate Intrinsic Value [Abstract]
Ending balance	106,104,660
Exercisable at end of period	75,666,879
Cash Proceeds and Tax Benefits [Abstract]
Exercised (in shares)	441,833	780,485	986,110
Cash proceeds	12,451,000	20,323,000	19,221,000
Intrinsic value of options exercised	13,132,000	19,273,000	19,383,000
Tax benefits realized	5,018,000	7,364,000	7,418,000
Grant Date Fair Value Assumptions [Abstract]
Expected volatility (in hundredths)	37.70%	38.70%	38.60%
Expected term (in years)	7 years 2 months 12 days	7 years 6 months 10 days	7 years 7 months 6 days
Risk-free interest rate (in hundredths)	2.26%	1.51%	1.61%
Expected dividend yield (in hundredths)	1.50%	1.50%	2.00%
Grant date fair value (in dollars per share)	$ 21.07	$ 16.42	$ 12.66
Share-based compensation	3,632,000	3,746,000	4,304,000
Recognized tax benefits	1,388,000	1,431,000	1,647,000
Unamortized compensation expense	3,400,000
Expense recognition over weighted average period (in years)	2 years 0 months 22 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	440,209
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	5,203,000	4,103,000	3,873,000
Unamortized compensation expense	3,000,000
Expense recognition over weighted average period (in years)	1 year 9 months 12 days
Restricted stock awards [Roll Forward]
Beginning balance (in shares)	490,264
Granted (at market price) (in shares)	92,619
Vested (in shares)	212,794	102,536	69,580
Forfeited (in shares)	4,230
Ending balance (in shares)	365,859	490,264
Restricted stock awards weighted average grant date fair value [Abstract]
Beginning balance (in dollars per share)	$ 26.98
Granted (at market price) (in dollars per share)	$ 58.18
Vested (in dollars per share)	$ 22.46
Forfeited (in dollars per share)	$ 31.22
Ending balance (in dollars per share)	$ 37.47	$ 26.98
Vested (in shares)	212,794	102,536	69,580
Fair value of restricted stock awards vested	12,354,000	4,544,000	2,338,000
ESPP Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under the ESPP (in shares)	22,508	26,644	31,275
Grant Date Fair Value of most recent ESPP Purchase (per share)	$ 12.03
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 200,000	$ 300,000	$ 300,000
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	1,399,876
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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Under the original plan 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).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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

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

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