Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

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Stock-Based Compensation (Details) (USD $)	3 Months Ended
Stock-Based Compensation (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved and authorized maximum number of shares to be issued			3,000,000
Compensation expense related to stock based awards outstanding	$ 788,000	$ 407,000
Exercise of stock options, shares	3,970	21,014
Proceeds received upon exercise of stock options	28,000	136,000
Total unrecognized compensation expense	$ 2,100,000
Share-based compensation cost not yet recognized, period for recognition	2 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, expiration period	10 years
Minimum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vesting period	3 years
Maximum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vesting period	5 years