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Stock Based Incentive Plan - Compensation Expense Related to Stock Incentive Plans (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation expense related to stock incentive plans recognized
Total	$ 1,303	$ 921	$ 1,091
Tax benefit on nonqualified stock option expense and restricted stock awards	296	203	292
Stock Options [Member]
Compensation expense related to stock incentive plans recognized
Total	408	301	211
Restricted Stock [Member]
Compensation expense related to stock incentive plans recognized
Total	859	587	834
Employee Stock Purchase Plan [Member]
Compensation expense related to stock incentive plans recognized
Total	$ 36	$ 33	$ 46

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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