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Retirement Plans (Benefit Payments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Retirement Income Plan [Member]
 
2012 $ 7,291
2013 8,038
2014 8,740
2015 9,514
2016 10,467
2017 - 2021 69,022
Retirement Life Plan [Member]
 
2012 342
2013 352
2014 360
2015 369
2016 377
2017 - 2021 $ 1,980