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Fair Value Measurement Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments under executive deferred compensation plan | $ 25,494,000 | $ 22,037,000 |
Private equity securities | 38,000 | 35,000 |
Private equity securities measured at net asset value | 5,121,000 | 5,498,000 |
Obligations under executive deferred compensation plan | 25,494,000 | 22,037,000 |
Foreign currency forward contracts, liabilities | 4,954,000 | 182,000 |
Transfers between levels 1 and 2 | 0 |  |
Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 659,874,000 | 606,957,000 |
Other Postretirement Benefits |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 834,000 | 2,232,000 | $ 3,292,000
Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments under executive deferred compensation plan | 25,494,000 | 22,037,000 |
Private equity securities | 38,000 | 35,000 |
Private equity securities measured at net asset value | 0 | 0 |
Obligations under executive deferred compensation plan | 25,494,000 | 22,037,000 |
Foreign currency forward contracts, liabilities | 0 | 0 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 493,848,000 | 460,247,000 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Other Postretirement Benefits |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets for Similar Items (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments under executive deferred compensation plan | 0 | 0 |
Private equity securities | 0 | 0 |
Private equity securities measured at net asset value | 0 | 0 |
Obligations under executive deferred compensation plan | 0 | 0 |
Foreign currency forward contracts, liabilities | 4,954,000 | 182,000 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 69,612,000 | 60,598,000 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Other Postretirement Benefits |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 834,000 | 2,232,000 |
Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments under executive deferred compensation plan | 0 | 0 |
Private equity securities | 0 | 0 |
Private equity securities measured at net asset value | 0 | 0 |
Obligations under executive deferred compensation plan | 0 | 0 |
Foreign currency forward contracts, liabilities | 0 | 0 |
Unobservable Inputs (Level 3) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Unobservable Inputs (Level 3) | Other Postretirement Benefits |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Measured at Fair Value | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 563,460,000 | 520,845,000 |
Measured at Fair Value | Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 493,848,000 | 460,247,000 |
Measured at Fair Value | Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 69,612,000 | 60,598,000 |
Measured at Fair Value | Unobservable Inputs (Level 3) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Absolute Return Measured At Net Asset Value | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 96,414,000 | 86,112,000 |
Absolute Return Measured At Net Asset Value | Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Absolute Return Measured At Net Asset Value | Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Absolute Return Measured At Net Asset Value | Unobservable Inputs (Level 3) | Pension Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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