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Employee Benefit Plans (Details 6) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Pension Plan [Member]
 
Expected amortization amounts, included in net periodic cost  
Prior service (credit) cost $ (141)
Actuarial loss 978
SERP [Member]
 
Expected amortization amounts, included in net periodic cost  
Prior service (credit) cost 1,696
Actuarial loss $ 2,028