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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

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Gross number of share options (or share units) granted during the period.

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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

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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