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Employee Benefit Plans Funded Status (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value plan assets $ 55,102 $ 57,011  
Pension Plans, Defined Benefit [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Projected benefit obligation (77,055) [1] (63,460) [1] (61,997)
Fair value plan assets 55,102 57,011 54,597
Funded status (21,953) (6,449)  
Other Postretirement Benefit Plans, Defined Benefit [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accumulated postretirement benefit obligation 9,651 [1] 8,345 [1] 9,132
Fair value plan assets 75 105 110
Funded status $ (9,576) $ (8,240)  
[1] As a result of the Pension Plan’s curtailment, the accumulated benefit obligation is equal to the projected benefit obligation as of December 31, 2011 and 2010.