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Employee Benefit Plans (Details 10) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Service cost - benefits earned during the year	$ 2,799	$ 2,073
Interest cost on projected benefit obligations	2,570	2,423
Supplemental Executive Retirement Plan [Member]
Service cost - benefits earned during the year	115	89	78
Interest cost on projected benefit obligations	307	295	315
Net amortization and deferral	360	250	258
Net periodic pension cost	$ 782	$ 634	$ 651

X

- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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-Publisher FASB

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X

- 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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X

- Definition

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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-Name Statement of Financial Accounting Standard (FAS)

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X

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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