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Stock-Based Employee Compensation (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) plan $ / shares shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock-based compensation plans | plan | 1 |  |
Maximum number of award to be granted per individual (in shares) | 500,000 |  |
Maximum aggregate number of shares available under the employee stock purchase plan (in shares) | 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 (in shares) | 184,936 | 91,586 | 74,100
Weighted-average price of shares of common stock issued under the ESPP plan (in dollars per share) | $ / shares | $ 48.08 | $ 98.20 | $ 97.50
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 |  |
Stock Option |  |  |
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% |  |
Shares issued (in shares) | 245,417 |  |
Shares granted (in shares) | 245,417 |  |
Restricted Stock |  |  |
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% |  |
Shares issued (in shares) | 260,924 |  |
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 (in shares) | 14,000,000 |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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