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Stock-Based Compensation Plans (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2017
Stock options [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted |  | 407,637
Performance Shares [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted |  | 154,351
Restricted Stock Units [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted | 7,869 | 443,734
Non-employee Stock Appreciation Rights [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted |  | 26,494
Non-employee Agent Stock Options [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted | 90 | 102,728
Non-employee Director Deferred Stock Units [Member] |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |
Shares granted | 6,110 | 20,644

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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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