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Pension Plans and Other Postretirement Benefits (Details-7) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Expected Cash Flows      
Expected employer contributions, 2016 $ 10,000    
Expected employer contributions, 2017 0    
Cash contributions to pension and other postretirement plans 13,676 $ 3,321 $ 34,765
Pension Benefits [Member]      
Benefit Payments      
Defined benefit plan expected future benefit payments, 2016 12,489    
Defined benefit plan expected future benefit payments, 2017 13,320    
Defined benefit plan expected future benefit payments, 2018 14,506    
Defined benefit plan expected future benefit payments, 2019 15,456    
Defined benefit plan expected future benefit payments, 2020 16,381    
Defined benefit plan expected future benefit payments, 2021-2025 95,167    
Postretirement Benefits [Member]      
Benefit Payments      
Defined benefit plan expected future benefit payments, 2016 2,892    
Defined benefit plan expected future benefit payments, 2017 3,232    
Defined benefit plan expected future benefit payments, 2018 3,674    
Defined benefit plan expected future benefit payments, 2019 4,157    
Defined benefit plan expected future benefit payments, 2020 4,585    
Defined benefit plan expected future benefit payments, 2021-2025 28,243    
Gross Postretirement Benefits [Member]      
Benefit Payments      
Defined benefit plan expected future benefit payments, 2016 3,119    
Defined benefit plan expected future benefit payments, 2017 3,481    
Defined benefit plan expected future benefit payments, 2018 3,947    
Defined benefit plan expected future benefit payments, 2019 4,453    
Defined benefit plan expected future benefit payments, 2020 4,910    
Defined benefit plan expected future benefit payments, 2021-2025 30,364    
Expected Medicare Part D Subsidy [Member]      
Benefit Payments      
Defined benefit plan expected future benefit payments, 2016 (227)    
Defined benefit plan expected future benefit payments, 2017 (249)    
Defined benefit plan expected future benefit payments, 2018 (273)    
Defined benefit plan expected future benefit payments, 2019 (296)    
Defined benefit plan expected future benefit payments, 2020 (325)    
Defined benefit plan expected future benefit payments, 2021-2025 $ (2,121)