Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Components of pre-tax stock-based compensation expense, net of forfeitures, and associated income tax effect
Pre-tax stock-based compensation expense	$ 449	$ 432	$ 1,531	$ 1,259
Income tax effect	174	166	594	486
Pre-tax stock-based compensation expense, net of forfeitures and associated income tax effect	275	266	937	773
Stock options [Member]
Components of pre-tax stock-based compensation expense, net of forfeitures, and associated income tax effect
Pre-tax stock-based compensation expense	15	18	46	53
Restricted stock [Member]
Components of pre-tax stock-based compensation expense, net of forfeitures, and associated income tax effect
Pre-tax stock-based compensation expense	$ 434	$ 414	$ 1,485	$ 1,206