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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Employer contributions     $ 8,582  
Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 700 448 1,862 1,343
Interest cost 1,474 1,378 4,230 4,135
Amortization of prior service costs (998) (1,063) (2,997) (3,188)
Amortization of net loss 1,157 1,652 3,934 4,956
Curtailment 0 0 (20) 0
Total net periodic benefit cost 2,333 2,415 7,009 7,246
Pension Plans
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 1,686 701 3,292 2,102
Interest cost 2,903 1,717 6,293 5,153
Expected return on plan assets (3,723) (1,740) (7,337) (5,222)
Amortization of prior service costs 30 34 85 103
Amortization of net loss 723 910 2,428 2,731
Curtailment 0 0 (18) 0
Total net periodic benefit cost $ 1,619 $ 1,622 $ 4,743 $ 4,867