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Equity Incentive Plans - Summary of non-vested stock options (Table) (Details)	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Shares
Outstanding at beginning of period | shares	104,250
Granted | shares	0
Vested | shares	0
Outstanding at end of period | shares	104,250
Weighted average exercise price
Outstanding at beginning of period	$ 27.5
Granted	0
Vested	0
Outstanding at end of period	27.5
Weighted Average Grant Date Fair Value
Outstanding at beginning of period	7.0605
Granted	0
Vested	0
Outstanding at end of period	$ 7.0605

X

- Definition

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

+ References

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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

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- Definition

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

+ References

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-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=109197908&loc=d3e5070-113901

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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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