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Employee Retirement plans (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Defined Benefit Plan, Expected Future Benefit Payments, 12/31/2013 $ 0
Defined Benefit Plan, Expected Future Benefit Payments, 12/31/2014 60,711
Defined Benefit Plan, Expected Future Benefit Payments, 12/31/2015 202,173
Defined Benefit Plan, Expected Future Benefit Payments, 12/31/2016 234,059
Defined Benefit Plan, Expected Future Benefit Payments, 12/31/2017 0
Defined Benefit Plan, Expected Future Benefit Payments, Next 5 Years $ 530,305