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Share-Based Compensation Plans (Details) - shares | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Restricted Stock Granted in Period |  |  |  |  |  |  |  | 543,570 | 943,160
Shares of Federated Class B Common Stock Granted to Non-Management Directors | 0 | 6,000 | 0 | 0 | 0 | 5,700 | 0 |  |
Class B Common Stock Bonus [Member] |  |  |  |  |  |  |  |  |
Restricted Stock Granted in Period |  |  |  |  |  |  |  |  | 464,660
Restricted stock requisite service period |  |  |  |  |  |  |  | 3 years |
Class B Common Stock Key Employees [Member] |  |  |  |  |  |  |  |  |
Restricted stock requisite service period |  |  |  |  |  |  |  | 10 years | 10 years

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- Definition The number of shares of Class B common stock awarded to non-management directors + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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