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Equity Incentive Plans - Summary of non-vested stock options and restricted shares (Table) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Shares |  |  |
Outstanding at beginning of period | 104,250 | 104,250 | 0
Granted | 0 | 0 | 104,250
Vested | 0 | 0 | 0
Outstanding at end of period | 104,250 | 104,250 | 104,250
Weighted average exercise price |  |  |
Outstanding at beginning of period | $ 27.5 | $ 27.5 | $ 0
Granted | 0 | 0 | 27.5
Vested | 0 | 0 | 0
Outstanding at end of period | 27.5 | 27.5 | 27.5
Weighted Average Grant Date Fair Value |  |  |
Outstanding at beginning of period | 7.0605 | 7.0605 | 0
Granted | 0 | 0 | 7.0605
Vested | 0 | 0 | 0
Outstanding at end of period | $ 7.0605 | $ 7.0605 | $ 7.0605

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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of non-vested options outstanding. + 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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