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Plan Information (Details) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) shares
Incentive compensation plan initiation year | 2014
Number of shares initially available for grant | 28.8
Maximum shares participants are eligible to receive | 2.0
Maximum cash award per employee | $ | $ 10.0
Number of years stock options expire from grant date | 10 years
Vesting period in which the fair value of shares on grant date is amortized over, years | 3 years
Minimum [Member] |
Stock options exercisable period | 2 years
Maximum [Member] |
Stock options exercisable period | 4 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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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