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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Compensation cost not yet recognized | $ 16.3 |  | $ 16.3 |
Compensation cost not yet recognized, period of recognition |  |  | 3 years 7 months 28 days |
Options granted in period (in shares) | 20,000 | 21,000 | 1,300,000 | 805,375

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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