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Stock-Based Incentive Compensation Plans (Details) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Stock options [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted | 27,463 | 481,404
Performance Shares [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted | 431 | 156,676
Restricted Stock Units [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted | 103,769 | 694,269
Non-employee Stock Appreciation Rights [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted |  | 14,692
Non-employee Agent Stock Options [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted |  | 32,400
Non-employee Director Deferred Stock Units [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted | 7,845 | 14,498

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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. + References No definition available. + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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