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Equity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Nonvested Options, Number of Shares |  |  |
Beginning of year | 431,235 |  |
Options granted | 196,350 | 174,600 | 148,950
Vested or forfeited | (142,225) |  |
End of year | 485,360 | 431,235 |
Weighted Average Grant Date Fair Value |  |  |
Beginning of year | $ 8.22 |  |
Granted | 14.31 |  |
Vested or forfeited | 8.11 |  |
End of year | $ 10.72 | $ 8.22 |

X
- Definition Number of nonvested share-based payment award options that vested or were forfeited during the period. + References No definition available. + Details
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Period Type: | duration

X
- Definition Weighted average grant date fair value of nonvested options that were vested or forfeited during the period. + References No definition available. + Details
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Period Type: | duration

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- References No definition available. + Details
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