Stock Based Compensation (Details) - Disclosure of Share-based Compensation Arrangements by Share-based Payment Award - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning balance	535,906
Granted
Exercised	(5,495)	(110,500)
Forfeited/cancelled/expired	(20,839)
Ending balance	509,572
Exercisable Ending Balance	503,941
Outstanding Beginning Balance, Weighted-Average Exercise Price	$ 6.48
Granted, Weighted-Average Exercise Price
Exercised, Weighted-Average Exercise Price	$ 7.67
Forfeited/cancelled/expired, Weighted-Average Exercise Price	9.77
Outstanding Ending Balance, Weighted-Average Exercise Price	6.34
Exercisable Ending Balance, Weighted-Average Exercise Price	$ 6.22
Outstanding Ending Balance - Weighted average remaining contractual term (years)	2 years 11 months 1 day
Exercisable Ending Balance - Weighted average remaining contractual term (years)	2 years 10 months 24 days
Outstanding Ending Balance - Aggregate intrinsic value	$ 5,102,923
Exercisable Ending Balance - Aggregate intrinsic value	$ 5,071,354

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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

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-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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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iv)(3)-(4)
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Weighted average price of options that were either forfeited or expired.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iv)(3)-(4)
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- Definition

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

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No definition available.

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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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- Definition

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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- 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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No definition available.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Number of share options (or share units) exercised during the current period.

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