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Share-Based Compensation (Details) (USD $)	3 Months Ended
Share-Based Compensation (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Share-Based Compensation (Textual) [Abstract]
Stock-based compensation expense under share based plans	$ 492,000	$ 348,000
Cash received from employee stock purchase plan	143,000	125,000
Unrecognized compensation expense related to unvested portion of all share-based compensation	$ 2,100,000
Expected weighted average recognition period for unrecognized compensation expense	1 year 3 months 18 days

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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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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