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Components of net periodic benefit cost (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Employer contributions     $ 3,296  
Pension Benefits [Member]
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 1,333 1,686 3,999 3,292
Interest cost 2,871 2,903 8,612 6,293
Expected return on plan assets (3,550) (3,723) (10,648) (7,337)
Amortization of prior service costs 9 30 27 85
Amortization of net loss 477 723 1,430 2,428
Curtailment 0 0 0 (18)
Net periodic benefit cost 1,140 1,619 3,420 4,743
Other Postretirement Benefits [Member]
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 397 700 1,191 1,862
Interest cost 1,603 1,474 4,809 4,230
Amortization of prior service costs (961) (998) (2,883) (2,997)
Amortization of net loss 925 1,157 2,777 3,934
Curtailment 0 0 0 (20)
Net periodic benefit cost $ 1,964 $ 2,333 $ 5,894 $ 7,009