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Employee Benefits Plans (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Amounts recognized in the Consolidated Balance Sheets    
Noncurrent asset $ 44,124 $ 2,698
Pension Plans    
Amounts recognized in the Consolidated Balance Sheets    
Noncurrent asset 44,124 2,698
Current liability (3,790) (3,739)
Noncurrent liability (484,892) (444,657)
Net amount recognized (444,558) (445,698)
Amounts recognized in accumulated other comprehensive loss (pre-tax)    
Prior service credit 0 (195)
Net actuarial loss 905,944 905,976
Net amount recognized $ 905,944 $ 905,781