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Defined Pension Plans (Details Textual) (USD $)	3 Months Ended		6 Months Ended
Defined Pension Plans (Details Textual) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension Plans, Defined Benefit [Member]
Pension Expense	$ 665,000	$ 466,000	$ 1,330,000	$ 932,000
Pension Contributions	750,000		1,500,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	1,500,000		1,500,000
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Pension Expense	$ 223,000	$ 159,000	$ 447,000	$ 317,000

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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