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Employee Benefit Plans (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
Summary of employee benefits charged to operating expenses
Payroll taxes	$ 278	$ 264	$ 857	$ 843
Medical plans	448	401	1,346	1,278
401k match	70	79	218	214
Pension plan	330	228	990	683
Profit-sharing	(100)	30	58	101
Other	69	37	242	137
Total employee benefits	$ 1,095	$ 1,039	$ 3,711	$ 3,256

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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