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Stock-Based Employee Compensation (Details) | 12 Months Ended |
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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 |  |  |  |

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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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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