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Related Party Transactions - Agreements with Carl Icahn (Details) - Nomination and Standstill Agreement - Icahn Group - shares |  | 12 Months Ended
--- | --- | ---
Sep. 15, 2014 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |
Ownership percentage limit (no more than) | 20.00% |
Net long position shares held, tranche one (in shares) |  | 1,900,000
Net long position shares held, tranche two (in shares) |  | 1,520,000
Net long position shares held, tranche three (in shares) |  | 1,266,667

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