Employee Benefit Plans (Schedule of Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Asset) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Employee Benefit Plans [Abstract]
Projected benefit obligation	$ 85,516	$ 77,230
Accumulated benefit obligation	85,516	77,230
Fair value of plan assets	$ 65,890	$ 58,148

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details