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Benefit obligations in excess of plan assets (Details 2) - Pension Benefits - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 442,960 $ 475,337
Accumulated benefit obligation 442,960 475,337
Fair value of plan assets $ 332,667 $ 354,363