v3.3.1.900
Defined Benefit Plans Defined Benefit Plans, Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]    
Net actuarial loss (gain) $ 239,225 $ 285,250
Prior service cost 0 0
Total 239,225 285,250
Net Actuarial Loss Estimated To Be Recognized As A Component of Net Periodic Benefit Cost in the Next Fiscal Year 8,336  
Prior Service Cost Estimated To Be Recognized As A Component of Net Periodic Benefit Cost in the Next Fiscal Year 0  
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 8,336  
Other Post-Retirement Benefits [Member]    
Net actuarial loss (gain) (1,845) 4,576
Prior service cost 559 807
Total (1,286) $ 5,383
Net Actuarial Loss Estimated To Be Recognized As A Component of Net Periodic Benefit Cost in the Next Fiscal Year 8  
Prior Service Cost Estimated To Be Recognized As A Component of Net Periodic Benefit Cost in the Next Fiscal Year 248  
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year $ 256