Employee Benefit Plans Employee Benefit Plans Pension Plan Assets Fair Value Measurement Reconciliation of Unobservable Inputs (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member]
Change in plan assets:
Fair value of plan assets at January 1	$ 22,582	$ 16,905
Distributions	(2,905)	(517)
Contributions	864	6,237
Unrealized loss on long-term investments	2,442	(1,810)
Realized gain on long-term investments	729	1,767
Fair value of plan assets at December 31	$ 23,712	$ 22,582

Employee Benefit Plans Employee Benefit Plans Pension Plan Assets Fair Value Measurement Reconciliation of Unobservable Inputs (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Significant Unobservable Inputs (Level 3) [Member]

Change in plan assets:

Fair value of plan assets at January 1

$ 22,582

$ 16,905

Distributions

(2,905)

(517)

Contributions

864

6,237

Unrealized loss on long-term investments

2,442

(1,810)

Realized gain on long-term investments

729

1,767

Fair value of plan assets at December 31

$ 23,712

$ 22,582

- Definition

The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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