Employee Benefit Plans (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension Plan [Member]
Plans' benefit obligation in excess of the fair value of plan assets
Projected benefit obligation	$ 51,112	$ 39,682
Accumulated benefit obligation	50,745	39,380
Fair value of plan assets	35,052	34,354
SERP [Member]
Plans' benefit obligation in excess of the fair value of plan assets
Projected benefit obligation	86,150	73,840
Accumulated benefit obligation	66,172	47,304
Fair value of plan assets	$ 0	$ 0

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