Represents the actual number of shares underlying each performance share award, expressed as a percentage.

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- Definition

Employee Purchase Plan Purchase Price Percentage of Fair Market Value

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No definition available.

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- Definition

Number Of Share Based Compensation Plans

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- Definition

Share Based Compensation Arrangement By Employee Stock Purchase Program Number Of Shares Available For Purchase

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No definition available.

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- Definition

Represents the maximum number of shares that can be awarded under a share-based compensation plan as a percentage of the target award.

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Options, Expiration Term

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Maximum Number of Shares that can be Granted to someone other than a non-employee board member in Any Fiscal Year.

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Maximum Value of Awards that Can be Granted to a non-employee board member in Any Fiscal Year.

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No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of grants made 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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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).

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- Definition

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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- Definition

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

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Stock-Based Employee Compensation (Details)	12 Months Ended
Stock-Based Employee Compensation (Details)	Dec. 31, 2017 USD ($) plan $ / shares shares	Dec. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 shares	Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans \| plan	2
Maximum number of award to be granted per individual	500,000
Maximum aggregate number of shares available under the employee stock purchase plan	1,300,000
Purchase price for each share of common stock as percentage of the average of the market price	85.00%
Shares of common stock issued under the ESPP plan	51,989	42,347	28,724
Weighted-average price of shares of common stock issued under the ESPP plan \| $ / shares	$ 93.15	$ 65.48	$ 72.52
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum value of awards that can be granted to participant in any fiscal year \| $	$ 500,000
Upper Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum expiry period for options	10 years
Stock Option \| Lower Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares	200.00%
Number of target performance shares issued (Shares)	140,542			63,771
Actual payout as percentage of target for performance shares issued in period					165.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares	200.00%
Number of target performance shares issued (Shares)	137,948
2008 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for issuance under stock-based compensation plans	14,000,000