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Stock-Based Compensation - Stock Option Activity (Narratives) (Details) - Stock Options $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($)
Stock-Based Compensation |
Intrinsic value of options exercised during the period | $ 0.3
Maximum |
Stock-Based Compensation |
Expiration period | 7 years
First anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Second anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Third anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Vesting period | 3 years

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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