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Pension and other postretirement benefits (plan assets and cash flows) (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2010
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2011
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2010
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2011
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2010
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2011
US Large Capitalization Equity Securities [Member]
Dec. 31, 2010
US Large Capitalization Equity Securities [Member]
Dec. 31, 2011
US Large Capitalization Equity Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2010
US Large Capitalization Equity Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2011
US Large Capitalization Equity Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2010
US Large Capitalization Equity Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2011
US Large Capitalization Equity Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2010
US Large Capitalization Equity Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2011
International Equity Securities [Member]
Dec. 31, 2010
International Equity Securities [Member]
Dec. 31, 2011
International Equity Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2010
International Equity Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2011
International Equity Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2010
International Equity Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2011
International Equity Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2010
International Equity Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2011
Mortgage Backed Securities [Member]
Dec. 31, 2010
Mortgage Backed Securities [Member]
Dec. 31, 2011
Mortgage Backed Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2010
Mortgage Backed Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2011
Mortgage Backed Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2010
Mortgage Backed Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2011
Mortgage Backed Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2010
Mortgage Backed Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2011
Government Debt Securities [Member]
Dec. 31, 2010
Government Debt Securities [Member]
Dec. 31, 2011
Government Debt Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2010
Government Debt Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2011
Government Debt Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2010
Government Debt Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2011
Government Debt Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2010
Government Debt Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2011
US Corporate Debt Securities [Member]
Dec. 31, 2010
US Corporate Debt Securities [Member]
Dec. 31, 2011
US Corporate Debt Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2010
US Corporate Debt Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2011
US Corporate Debt Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2010
US Corporate Debt Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2011
US Corporate Debt Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2010
US Corporate Debt Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2011
US Small and Mid Capitalization Equity Securities [Member]
Dec. 31, 2010
US Small and Mid Capitalization Equity Securities [Member]
Dec. 31, 2011
US Small and Mid Capitalization Equity Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2010
US Small and Mid Capitalization Equity Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2011
US Small and Mid Capitalization Equity Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2010
US Small and Mid Capitalization Equity Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2011
US Small and Mid Capitalization Equity Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2010
US Small and Mid Capitalization Equity Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2011
Other Debt Securities [Member]
Dec. 31, 2010
Other Debt Securities [Member]
Dec. 31, 2011
Other Debt Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2010
Other Debt Securities [Member]
Fair value measurements using quoted prices in active markets for identical assets (Level 1) [Member]
Dec. 31, 2011
Other Debt Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2010
Other Debt Securities [Member]
Fair value measurements using significant other observable inputs (Level 2) [Member]
Dec. 31, 2011
Other Debt Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Dec. 31, 2010
Other Debt Securities [Member]
Fair value measurements using significant unobservable inputs (Level 3) [Member]
Jan. 31, 2012
Postretirement Benefit Plan [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
Dec. 31, 2010
Postretirement Benefit Plan [Member]
Dec. 31, 2009
Postretirement Benefit Plan [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
Gross Benefit Payments [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
Expected Medicare Subsidy [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
Net Benefit Payments [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
US Large Capitalization Equity Securities [Member]
Dec. 31, 2010
Postretirement Benefit Plan [Member]
US Large Capitalization Equity Securities [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
International Equity Securities [Member]
Dec. 31, 2010
Postretirement Benefit Plan [Member]
International Equity Securities [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2010
Postretirement Benefit Plan [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
Fixed Income Securities [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
Government Debt Securities [Member]
Dec. 31, 2010
Postretirement Benefit Plan [Member]
Government Debt Securities [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
US Corporate Debt Securities [Member]
Dec. 31, 2010
Postretirement Benefit Plan [Member]
US Corporate Debt Securities [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
US Small and Mid Capitalization Equity Securities [Member]
Dec. 31, 2010
Postretirement Benefit Plan [Member]
US Small and Mid Capitalization Equity Securities [Member]
Dec. 31, 2011
Postretirement Benefit Plan [Member]
Other Debt Securities [Member]
Dec. 31, 2010
Postretirement Benefit Plan [Member]
Other Debt Securities [Member]
Dec. 31, 2011
Pension Plans [Member]
Dec. 31, 2010
Pension Plans [Member]
Dec. 31, 2009
Pension Plans [Member]
Dec. 31, 2011
Pension Plans [Member]
Gross Benefit Payments [Member]
Allocation of plan assets by asset category [Abstract]                                                                                                                                                                                
Allocation of plan assets, equity securities (in hundredths)                                                                                                                                           33.00% 34.00% 16.00% 18.00%               8.00% 8.00%            
Allocation of plan assets, debt securities (in hundredths)                                                                                                                                                   10.00% 14.00%   14.00% 13.00% 19.00% 10.00%     0.00% 3.00%        
Allocation of plan assets, total (in hundredths)                                                                                                                               100.00% 100.00%                                              
Target allocation of plan assets by asset category [Abstract]                                                                                                                                                                                
Target allocation of plan assets, equity securities (in hundredths)                                                                                                                                           33.00%   18.00%                 7.00%              
Target allocation of plan assets, debt securities (in hundredths)                                                                                                                                                       42.00%                        
Fair value of plan assets [Abstract]                                                                                                                                                                                
Fair value of plan assets $ 42,980 $ 61,625 $ 57,642 $ 39,685 $ 0 $ 0 $ 33,613 $ 34,332 $ 0 $ 16,554 $ 33,613 $ 17,778 $ 0 $ 0 $ 16,023 $ 18,357 $ 15,615 $ 18,027 $ 408 $ 330 $ 0 $ 0 $ 9,698 $ 14,113 $ 2,193 $ 0 $ 7,505 $ 14,113 $ 0 $ 0 $ 14,151 $ 13,531 $ 12,006 $ 7,544 $ 2,145 $ 5,987 $ 0 $ 0 $ 19,319 $ 9,725 $ 5,655 $ 8,611 $ 13,664 $ 1,114 $ 0 $ 0 $ 7,803 $ 8,153 $ 7,606 $ 8,064 $ 197 $ 89 $ 0 $ 0 $ 15 $ 3,099 $ (95) $ 2,825 $ 110 $ 274 $ 0 $ 0   $ 100,622 $ 101,310 $ 90,320                                     $ 0 $ 0 $ 0  
Cash surrender value of life insurance policies                                                                                                                                                                         6,619 6,291    
Estimated future benefit payments [Abstract]                                                                                                                                                                                
2012                                                                                                                                     12,000 1,200 10,800                                     320
2013                                                                                                                                     12,600 1,200 11,400                                     310
2014                                                                                                                                     13,100 1,300 11,800                                     300
2015                                                                                                                                     13,400 1,400 12,000                                     300
2016                                                                                                                                     13,300 1,500 11,800                                     290
2017 - 2021                                                                                                                                     61,600 7,500 54,100                                     1,330
Employer contributions                                                                                                                             $ 7,000