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Fair value - pension and postretirement (Details 9) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year $ 334,844,000 $ 309,184,000 $ 278,000,000
Percentage investment in common stock of large-cap U.S. companies 34.00% 26.00%  
Percentage investment in US Treasuries 11.00% 13.00%  
Percentage investment in common stock of mid-cap U.S. companies 11.00% 12.00%  
Percentage investment in corporate bonds 27.00% 41.00%  
Percentage investment in other investments 17.00% 8.00%  
Estimated future employer contributions in next fiscal year 32,500,000    
Pension Benefits | Cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 9,406,000 12,605,000  
Pension Benefits | Equity securities of U.S. companies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 62,599,000 86,981,000  
Pension Benefits | Equities Securities of International companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 39,437,000 39,818,000  
Pension Benefits | Collective and Mutual funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 158,748,000 [1] 102,852,000 [2]  
Pension Benefits | Corporate debt securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 42,721,000 45,112,000  
Pension Benefits | Municipal bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 7,561,000 9,302,000  
Pension Benefits | U.S. Treasury securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 11,822,000 12,514,000  
Pension Benefits | Total assets measured at fair value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 332,294,000 309,184,000  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 2,145,000  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities of U.S. companies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 62,599,000 86,981,000  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equities Securities of International companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 39,437,000 39,818,000  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collective and Mutual funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 116,265,000 [1] 82,787,000 [2]  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 7,487,000 7,980,000  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total assets measured at fair value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 225,788,000 219,711,000  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 9,406,000 10,460,000  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Equity securities of U.S. companies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Equities Securities of International companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Collective and Mutual funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 42,483,000 [1] 20,065,000 [2]  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Corporate debt securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 42,721,000 45,112,000  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Municipal bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 7,561,000 9,302,000  
Pension Benefits | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 4,335,000 4,534,000  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Total assets measured at fair value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 106,506,000 89,473,000  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Equity securities of U.S. companies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Equities Securities of International companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Collective and Mutual funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 [1] 0 [2]  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Corporate debt securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Municipal bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Total assets measured at fair value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Other Postretirement Benefits
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 84,543,000 74,361,000 68,085,000
Percentage investment in common stock of large-cap U.S. companies 55.00% 51.00%  
Percentage investment in US Treasuries 12.00% 15.00%  
Percentage investment in mortgage backed securities 8.00% 10.00%  
Percentage investment in common stock of mid-cap U.S. companies 8.00%    
Percentage investment in corporate bonds 9.00% 11.00%  
Percentage investment in other investments 8.00% 13.00%  
Estimated future employer contributions in next fiscal year 1,500,000    
Other Postretirement Benefits | Cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 2,142,000 3,044,000  
Other Postretirement Benefits | Equity securities of U.S. companies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 2,802,000 2,207,000  
Other Postretirement Benefits | Equities Securities of International companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 221,000 260,000  
Other Postretirement Benefits | Insurance investment contract [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 79,374,000 [3] 68,850,000 [4]  
Other Postretirement Benefits | Total assets measured at fair value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 84,539,000 74,361,000  
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 3,023,000 3,520,000  
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 1,053,000  
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities of U.S. companies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 2,802,000 2,207,000  
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equities Securities of International companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 221,000 260,000  
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance investment contract [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 [3] 0 [4]  
Other Postretirement Benefits | Significant Other Observable Inputs (Level 2)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 81,516,000 70,841,000  
Other Postretirement Benefits | Significant Other Observable Inputs (Level 2) | Cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 2,142,000 1,991,000  
Other Postretirement Benefits | Significant Other Observable Inputs (Level 2) | Equity securities of U.S. companies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Other Postretirement Benefits | Significant Other Observable Inputs (Level 2) | Equities Securities of International companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Other Postretirement Benefits | Significant Other Observable Inputs (Level 2) | Insurance investment contract [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 79,374,000 [3] 68,850,000 [4]  
Other Postretirement Benefits | Significant Unobservable Inputs (Level 3)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Other Postretirement Benefits | Significant Unobservable Inputs (Level 3) | Cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Other Postretirement Benefits | Significant Unobservable Inputs (Level 3) | Equity securities of U.S. companies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Other Postretirement Benefits | Significant Unobservable Inputs (Level 3) | Equities Securities of International companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Other Postretirement Benefits | Significant Unobservable Inputs (Level 3) | Insurance investment contract [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year $ 0 [3] $ 0 [4]  
[1] Collective and mutual funds invest approximately 11 percent in common stock of mid-cap U.S. companies, 34 percent in common stock of large-cap U.S. companies, 11 percent in U.S. Treasuries, 27 percent in corporate bonds and 17 percent in other investments.
[2] Collective and mutual funds invest approximately 12 percent in common stock of mid-cap U.S. companies, 26 percent in common stock of large-cap U.S. companies, 13 percent in U.S. Treasuries, 41 percent in corporate bonds and 8 percent in other investments.
[3] The insurance contract invests approximately 55 percent in common stock of large-cap U.S. companies, 12 percent in U.S. Treasuries, 8 percent in mortgage-backed securities, 8 percent in common stock of mid-cap U.S. companies, 9 percent in corporate bonds and 8 percent in other investments.
[4] The insurance contract invests approximately 51 percent in common stock of large-cap U.S. companies, 15 percent in U.S. Treasuries, 10 percent in mortgage-backed securities, 11 percent in corporate bonds and 13 percent in other investments.