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Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total stock-based compensation	$ 1,791	$ 1,992	$ 1,657
Non-qualified stock options [Member]
Total stock-based compensation	711	963	794
Restricted stock units [Member]
Total stock-based compensation	717	650	584
Board of Directors stock grants [Member]
Total stock-based compensation	$ 363	$ 379	$ 279

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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