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Employee Benefit Plans (Schedule of Amounts Recognized on the Balance Sheet) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Employee Benefit Plans [Abstract]    
Accrued benefit liability $ (19,626) $ (19,082)
Accumulated other comprehensive loss, net of tax 29,620 27,543
Deferred tax asset 17,396 16,176
Nat amount recognized $ 27,390 $ 24,637