Retirement Plans (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Components of net periodic pension expense
Interest cost	$ (250,000)	$ (258,000)
Expected return on plan assets	430,000	421,000
Recognized net actuarial loss	(301,000)	(267,000)
Net periodic pension expense (benefit)	(121,000)	(104,000)
Contributions to the pension plan	$ 300,000
Employee hired on or after January 1, 2006 \| Maximum
Retirement Plans
Requisite age of employees for receiving retirement benefits under the new benefit formula	45 years
Requisite service period for receiving retirement benefits under the new benefit formula	5 years
Non-contributory defined benefit pension plan \| Employees hired on or before December 31, 2005 \| Minimum
Retirement Plans
Requisite age of employees for receiving retirement benefits under the plan	21 years

Represents the age of employees to be eligible to participate in the defined benefit plan.

No definition available.

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- Definition

Represents the age of employees to be eligible to participate in the defined benefit plan under new benefit formula.

+ References

No definition available.

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- Definition

Represents the period that the employee is required to perform services in order to receive retirement benefit.

+ References

No definition available.

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

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-Glossary Expected Return on Plan Assets

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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