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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Stock Based Compensation [Abstract]
Percentage of eligible earnings to purchase common stock through the employee stock purchase plan (in hundredths)	10.00%
Discount on the average closing price for the employee stock purchase plan (in hundredths)	5.00%
Stock Based Compensation Expense [Abstract]
Stock based compensation	$ 18,979	$ 13,801
Tax effect recognized in net income	6,643	4,830
Windfall tax benefit/(shortfall), net	$ 0	$ 4,107
Employee stock options granted during the period (in shares)	547,125	537,555
Fair value per share (in dollars per share)	$ 34.44	$ 33.76
Weighted average assumptions used to value option grants [Abstract]
Risk-free interest rate (%) (in hundredths)	1.41%	1.51%
Expected option life (years)	5 years 2 months 14 days	5 years 1 month 5 days
Expected volatility (%) (in hundredths)	21.63%	22.28%
Expected dividend yield (%) (in hundredths)	0.70%	0.63%
Cash received from exercise of options	$ 1,900	$ 7,400
Restricted stock awards granted during period (in shares)	315,000	304,175
Weighted average fair value per share of restricted stock awards granted during the period (in dollars per share)	$ 167.11	$ 149.66
Restricted stock awards vested during period (in shares)	32,702
Weighted average grant date fair value per share (in dollars per share)	$ 125.86
Weighted average vest date fair value per share (in dollars per share)	$ 171.60
Shares of stock purchased during the period by participants in the employee stock purchase plan (in shares)	5,007	5,042
Amount paid for stock purchased during the period by participants in the employee stock purchase plan	$ 880	$ 790

X

- Definition

The weighted average fair value as of vest dates pertaining to a share-based award plan other than a stock option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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The quantity of shares issuable on restricted awards granted under the plan during the reporting period.

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The total consideration received during the period for purchases of shares of stock from participants of the employee stock purchase plan.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Discount rate from fair value on purchase date that participants pay for shares.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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

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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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