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Pension and Other Postretirement Benefits Funded status of plans (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Current liabilities $ (8,410) $ (18,683)
Pension Plans, Defined Benefit [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Funded status (39,015) (78,720)
Non-current assets 2,547 0
Current liabilities (1,714) (10,842)
Non-current liabilities (39,848) (67,878)
Net amount recognized (39,015) (78,720)
Net loss 45,642 81,417
Prior service cost (benefit) 376 472
Total recognized in accumulated other comprehensive loss (pre-tax) 46,018 81,889
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Funded status (134,652) (149,263)
Non-current assets 0 0
Current liabilities (5,368) (6,158)
Non-current liabilities (129,284) (143,105)
Net amount recognized (134,652) (149,263)
Net loss 65,754 94,947
Prior service cost (benefit) (19,595) (23,611)
Total recognized in accumulated other comprehensive loss (pre-tax) $ 46,159 $ 71,336