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Components of net periodic benefit cost (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Employer contributions     $ 5,458  
Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 370 475 895 834
Interest cost 1,271 1,478 2,757 2,864
Expected return on plan assets 0 0 0 0
Amortization of prior service costs (1,065) [1] (15,534) [1] (2,125) (30,689)
Amortization of net loss 1,808 6,546 3,304 12,349
Total net periodic benefit cost 2,384 (7,035) 4,831 (14,642)
Pension Plans
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 506 709 1,401 1,566
Interest cost 1,606 1,808 3,436 3,488
Expected return on plan assets (1,782) (1,776) (3,482) (3,315)
Amortization of prior service costs 34 [1] 34 [1] 69 69
Amortization of net loss 1,133 449 1,821 931
Total net periodic benefit cost $ 1,497 $ 1,224 $ 3,245 $ 2,739
[1] Plan amendments made in November 2010 resulted in a reduction in OPEB liability and a credit to accumulated other comprehensive loss. The resulting prior service benefit and actuarial losses were amortized ratably into income over the period November 1, 2010 to June 30, 2011 at which time the CAWV OPEB plan terminated.