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Fair value - pension and postretirement (Details 9) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year $ 332,667,000 $ 354,363,000 $ 334,844,000
Percentage investment in common stock of large-cap U.S. companies 19.00% 13.00%  
Percentage investment in common stock of mid-cap U.S. companies 6.00%    
Percentage investment in US Government securities   13.00%  
Percentage investment in corporate bonds 16.00% 23.00%  
Percentage investment in common stock of international companies 29.00% 33.00%  
Percentage investment in cash equivalents 16.00%    
Percentage investment in other investments 14.00% 18.00%  
Estimated future employer contributions in next fiscal year $ 0    
Pension Benefits | Cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 8,379,000 $ 5,631,000  
Pension Benefits | Equity securities of U.S. companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 15,135,000 39,077,000  
Pension Benefits | Equities Securities of International companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 2,332,000 5,189,000  
Pension Benefits | Collective and Mutual funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 217,968,000 [1] 209,852,000 [2]  
Pension Benefits | Corporate debt securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 62,145,000 59,471,000  
Pension Benefits | Municipal bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 11,680,000 10,462,000  
Pension Benefits | U.S. Government securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 12,111,000 21,850,000  
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 329,750,000 351,532,000  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash equivalents [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) | Equity securities of U.S. companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 15,135,000 39,077,000  
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 2,332,000 5,189,000  
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 154,400,000 [1] 132,403,000 [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. Government securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 5,288,000 15,001,000  
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 177,155,000 191,670,000  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 8,379,000 5,631,000  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Equity securities of U.S. 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) | 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 63,568,000 [1] 77,449,000 [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 62,145,000 59,471,000  
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 11,680,000 10,462,000  
Pension Benefits | Significant Other Observable Inputs (Level 2) | U.S. Government securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 6,823,000 6,849,000  
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 152,595,000 159,862,000  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Cash equivalents [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) | Equity securities of U.S. 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) | 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. Government 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) | 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 $ 82,593,000 $ 87,586,000 $ 84,543,000
Percentage investment in common stock of large-cap U.S. companies 19.00% 54.00%  
Percentage investment in US Government securities 22.00% 11.00%  
Percentage investment in corporate bonds 36.00% 10.00%  
Percentage investment in other investments 13.00% 15.00%  
Percentage investment in mortgage backed securities 10.00% 10.00%  
Estimated future employer contributions in next fiscal year $ 800,000    
Other Postretirement Benefits | Cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 3,261,000 $ 2,097,000  
Other Postretirement Benefits | Equity securities of U.S. companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 2,274,000 2,614,000  
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 9,000 25,000  
Other Postretirement Benefits | Insurance investment contract      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 77,044,000 [3] 82,846,000 [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 82,588,000 87,582,000  
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 2,283,000 2,639,000  
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 0 0  
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities of U.S. companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 2,274,000 2,614,000  
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 9,000 25,000  
Other Postretirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance investment contract      
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 80,305,000 84,943,000  
Other Postretirement Benefits | Significant Other Observable Inputs (Level 2) | Cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 3,261,000 2,097,000  
Other Postretirement Benefits | Significant Other Observable Inputs (Level 2) | Equity securities of U.S. 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) | 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      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 77,044,000 [3] 82,846,000 [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 [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) | Equity securities of U.S. 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) | 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      
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 19 percent in common stock of large-cap U.S. companies, 6 percent in common stock of mid-cap U.S. companies, 16 percent in corporate bonds, 29 percent in common stock of international companies, 16 percent in cash equivalents and 14 percent in other investments.
[2] Collective and mutual funds invest approximately 13 percent in common stock of large-cap U.S. companies, 13 percent in U.S. Government securities, 23 percent in corporate bonds, 33 percent in common stock of international companies and 18 percent in other investments.
[3] The insurance contract invests approximately 19 percent in common stock of large-cap U.S. companies, 22 percent in U.S. Government securities, 10 percent in mortgage-backed securities, 36 percent in corporate bonds and 13 percent in other investments.
[4] The insurance contract invests approximately 54 percent in common stock of large-cap U.S. companies, 11 percent in U.S. Government securities, 10 percent in mortgage-backed securities, 10 percent in corporate bonds and 15 percent in other investments.