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Fair Value Measurement Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Transfers between levels 1 and 2 |  | $ 0 |  |  |  |
Investments under executive deferred compensation plan | [1] | 22,037,000 |  | $ 21,631,000 |  |
Private equity securities | [2] | 35,000 |  | 31,000 |  |
Private equity securities measured at net asset value | [2],[3],[4] | 5,498,000 |  | 2,595,000 |  |
Obligations under executive deferred compensation plan | [1] | 22,037,000 |  | 21,631,000 |  |
Foreign currency forward contracts, liabilities | [5] | 182,000 |  | 250,000 |  |
Total Pension Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 606,957,000 |  | 619,995,000 |  |
Other Postretirement Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2,232,000 | [4] | 3,292,000 | [4] | $ 4,439,000
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 | [1] | 22,037,000 |  | 21,631,000 |  |
Private equity securities | [2] | 35,000 |  | 31,000 |  |
Private equity securities measured at net asset value |  | 0 |  | 0 |  |
Obligations under executive deferred compensation plan | [1] | 22,037,000 |  | 21,631,000 |  |
Foreign currency forward contracts, liabilities |  | 0 |  | 0 |  |
Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 460,247,000 |  | 481,837,000 |  |
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 | [5] | 182,000 |  | 250,000 |  |
Quoted Prices in Active Markets for Similar Items (Level 2) | Total Pension Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 60,598,000 |  | 57,412,000 |  |
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 | [4] | 2,232,000 |  | 3,292,000 |  |
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) | Total Pension Benefits |  |  |  |  |  |
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 | Total Pension Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4] | 520,845,000 |  | 539,249,000 |  |
Measured at Fair Value | Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4] | 460,247,000 |  | 481,837,000 |  |
Measured at Fair Value | Quoted Prices in Active Markets for Similar Items (Level 2) | Total Pension Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4] | 60,598,000 |  | 57,412,000 |  |
Measured at Fair Value | Unobservable Inputs (Level 3) | Total Pension Benefits |  |  |  |  |  |
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 | Total Pension Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets | [6] | 86,112,000 |  | 80,746,000 |  |
Absolute Return Measured At Net Asset Value | Quoted Prices in Active Markets for Identical Items (Level 1) | Total Pension Benefits |  |  |  |  |  |
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) | Total Pension Benefits |  |  |  |  |  |
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) | Total Pension Benefits |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 0 |  | $ 0 |  |
[1] | We maintain an EDCP that was adopted in 2001 and subsequently amended. The purpose of the EDCP is to provide current tax planning opportunities as well as supplemental funds upon the retirement or death of certain of our employees. The EDCP is intended to aid in attracting and retaining employees of exceptional ability by providing them with these benefits. We also maintain a Benefit Protection Trust (the “Trust”) that was created to provide a source of funds to assist in meeting the obligations of the EDCP, subject to the claims of our creditors in the event of our insolvency. Assets of the Trust are consolidated in accordance with authoritative guidance. The assets of the Trust consist primarily of mutual fund investments (which are accounted for as trading securities and are marked-to-market on a monthly basis through the consolidated statements of income) and cash and cash equivalents. As such, these assets and obligations are classified within Level 1.
[2] | Primarily consists of private equity securities classified as available-for-sale and are reported in Investments in the consolidated balance sheets. The changes in fair value are reported in Other income (expenses), net, in our consolidated statements of income.
[3] | Holdings in private equity securities are measured at fair value using the net asset value per share (or its equivalent) practical expedient and have not been categorized in the fair value hierarchy as a result of the adoption of new accounting guidance effective January 1, 2016 on a retrospective basis. The fair value amounts of $5.5 million and $2.6 million as of December 31, 2016 and 2015, respectively, are included in this table to permit reconciliation to the marketable equity securities presented in Note 10, “Investments.” See Note 1, “Summary of Significant Accounting Policies,” for additional information.
[4] | See Note 15 “Pension Plans and Other Postretirement Benefits” for further information about fair value measurements of our pension and postretirement plan assets
[5] | As a result of our global operating and financing activities, we are exposed to market risks from changes in foreign currency exchange rates, which may adversely affect our operating results and financial position. When deemed appropriate, we minimize our risks from foreign currency exchange rate fluctuations through the use of foreign currency forward contracts. Unless otherwise noted, these derivative financial instruments are not designated as hedging instruments under ASC 815, Derivatives and Hedging. The foreign currency forward contracts are valued using broker quotations or market transactions in either the listed or over-the-counter markets. As such, these derivative instruments are classified within Level 2.
[6] | Consists primarily of funds with holdings in private investment companies. See additional information about the Absolute Return investments below. Holdings in private investment companies are measured at fair value using the net asset value per share as a practical expedient and have not been categorized in the fair value hierarchy as a result of the adoption of new accounting guidance effective January 1, 2016 on a retrospective basis. The fair value amounts of $86.1 million and $80.7 million as of December 31, 2016 and 2015, respectively, are included in this table to permit reconciliation to the reconciliation of plan assets table above. See Note 1, “Summary of Significant Accounting Policies,” for additional information.

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