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Change in benefit obligations and plan assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits
      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 459,111 $ 435,618  
Service cost 155 1,078 2,252
Interest cost 16,249 17,598 19,500
Plan participants' contributions 0 0  
Amendments 0 0  
Actuarial (gain) loss (44,551) 30,939  
Benefits paid (28,192) (26,122)  
Benefit obligation at end of year 402,772 459,111 435,618
Change in net plan assets:      
Fair value of plan assets at beginning of year 309,184 278,000  
Actual gain on plan assets 35,539 34,493  
Employer contribution 18,313 22,813  
Plan participants' contributions 0 0  
Benefits paid (28,192) (26,122)  
Fair value of net plan assets at end of year 334,844 309,184 278,000
Funded status - (under) over (67,928) (149,927)  
Amounts recognized in the Consolidated Balance Sheets at December 31:      
Other assets (noncurrent) 0 0  
Other accrued liabilities (current) 0 0  
Other liabilities (noncurrent) (67,928) (149,927)  
Net amount recognized (67,928) (149,927)  
Amounts recognized in accumulated other comprehensive (income) loss consist of:      
Actuarial loss 135,061 202,406  
Prior service cost (credit) 365 437  
Total 135,426 202,843  
Other Postretirement Benefits
      
Change in benefit obligation:      
Benefit obligation at beginning of year 103,358 110,689  
Service cost 1,675 1,747 1,443
Interest cost 3,215 4,166 4,700
Plan participants' contributions 1,472 2,688  
Amendments 0 (11,418)  
Actuarial (gain) loss (20,985) 3,469  
Benefits paid (7,009) (7,983)  
Benefit obligation at end of year 81,726 103,358 110,689
Change in net plan assets:      
Fair value of plan assets at beginning of year 74,361 68,085  
Actual gain on plan assets 13,819 6,497  
Employer contribution 1,900 5,074  
Plan participants' contributions 1,472 2,688  
Benefits paid (7,009) (7,983)  
Fair value of net plan assets at end of year 84,543 74,361 68,085
Funded status - (under) over 2,817 (28,997)  
Amounts recognized in the Consolidated Balance Sheets at December 31:      
Other assets (noncurrent) 9,679 0  
Other accrued liabilities (current) (381) (655)  
Other liabilities (noncurrent) (6,481) (28,342)  
Net amount recognized (2,817) (28,997)  
Amounts recognized in accumulated other comprehensive (income) loss consist of:      
Actuarial loss 11,314 43,589  
Prior service cost (credit) (17,137) (18,594)  
Total $ (5,823) $ 24,995