Benefits 2 (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension member
Benefits [Line Items]
Projected benefit obligation	$ 225,077	$ 193,686
Accumulated benefit obligation	212,056	183,529
Fair value of plan assets	132,795	127,000
OPEB member
Benefits [Line Items]
Accumulated benefit obligation	104,083	82,287
Fair value of plan assets	$ 75,620	$ 68,385

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.

+ References+ Details

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.

+ References+ Details

- 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