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Employee and Non-Employee Director Stock and Benefit Plans (Details 7) (ESPP, USD $)	1 Months Ended	12 Months Ended
	Feb. 28, 1998	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ESPP
Employee and non-employee director stock and benefit plans
Discount rate at which employees can purchase shares (as a percent)	15.00%
Share-based compensation expense		$ 390,000	$ 451,000	$ 394,000

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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