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Fair value - pension (Details 8) - Qualified Plan [Member] - Underfunded Plan [Member] - Pension Benefits - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year $ 307,809 $ 354,384 $ 333,509
Percentage investment in common stock of international companies 27.00% 31.00%  
Percentage investment in corporate bonds 31.00% 28.00%  
Percentage investment in common stock of large-cap U.S. companies 18.00% 19.00%  
Percentage investment in cash equivalents 5.00% 7.00%  
Percentage Investment in US Government Securities   1.00%  
Percentage investment in other investments 19.00% 14.00%  
Estimated future employer contributions in next fiscal year $ 4,000    
Cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 4,930 $ 3,814  
Equity securities of U.S. companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 11,038 13,345  
Equities securities of International companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 967 1,766  
Collective and mutual funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 197,560 239,571  
Corporate debt securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 73,110 74,956  
Municipal bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 10,624 8,546  
U.S. Government securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 6,375 9,331  
Total assets measured at fair value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of net plan assets at end of year 304,604 351,329  
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 11,038 13,345  
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   1,766  
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 145,960 171,822  
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 479 1,038  
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 157,477 187,971  
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 4,930 3,814  
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 967    
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 51,600 67,749  
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 73,110 74,956  
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 10,624 8,546  
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 5,896 8,293  
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 $ 147,127 $ 163,358