Stock Based Compensation (Details) - Disclosure of Share-based Compensation Arrangements by Share-based Payment Award - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding Beginning Balance	535,906
Granted
Exercised	(136,429)	(340,492)	(100,911)
Outstanding Ending Balance	354,467	535,906
Exercisable Ending Balance	350,937
Outstanding Beginning Balance, Weighted-Average Exercise Price	$ 6.48
Outstanding Ending Balance, Weighted-Average Exercise Price	6.26	$ 6.48
Exercisable Ending Balance, Weighted-Average Exercise Price	$ 6.18
Outstanding Ending Balance - Aggregate intrinsic value	$ 6,979,455
Exercisable Ending Balance - Aggregate intrinsic value	$ 6,938,024

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii)
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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