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Fair Value Measurement | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurement | Fair Value Measurement: Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The inputs used to measure fair value are classified into the following hierarchy:
Level 1 | Unadjusted quoted prices in active markets for identical assets or liabilities
Level 2 | Unadjusted quoted prices in active markets for similar assets or liabilities, or unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable for the asset or liability
Level 3 | Unobservable inputs for the asset or liability
We endeavor to utilize the best available information in measuring fair value. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Transfers between levels of the fair value hierarchy are deemed to have occurred on the date of the event or change in circumstance that caused the transfer. There were no transfers between Levels 1 and 2 during the year ended December 31, 2017. The following tables set forth our financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2017 and 2016 (in thousands):
| December 31, 2017 |  | Quoted Prices in Active Markets for Identical Items (Level 1) |  | Quoted Prices in Active Markets for Similar Items (Level 2) |  | Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Investments under executive deferred compensation plan(a) | $ | 25,494 |  |  | $ | 25,494 |  |  | $ | — |  |  | $ | — |
Private equity securities(b) | $ | 38 |  |  | $ | 38 |  |  | $ | — |  |  | $ | — |
Private equity securities measured at net asset value(b)(c) | $ | 5,121 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Pension assets(d) | $ | 563,460 |  |  | $ | 493,848 |  |  | $ | 69,612 |  |  | $ | — |
Pension assets measured at net asset value(d) | $ | 96,414 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Postretirement assets(d) | $ | 834 |  |  | $ | — |  |  | $ | 834 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Obligations under executive deferred compensation plan (a) | $ | 25,494 |  |  | $ | 25,494 |  |  | $ | — |  |  | $ | — |
Foreign currency forward contracts(e) | $ | 4,954 |  |  | $ | — |  |  | $ | 4,954 |  |  | $ | — |
| December 31, 2016 |  | Quoted Prices in Active Markets for Identical Items (Level 1) |  | Quoted Prices in Active Markets for Similar Items (Level 2) |  | Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Investments under executive deferred compensation plan(a) | $ | 22,037 |  |  | $ | 22,037 |  |  | $ | — |  |  | $ | — |
Private equity securities(b) | $ | 35 |  |  | $ | 35 |  |  | $ | — |  |  | $ | — |
Private equity securities measured at net asset value(b)(c) | $ | 5,498 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Pension assets(d) | $ | 520,845 |  |  | $ | 460,247 |  |  | $ | 60,598 |  |  | $ | — |
Pension assets measured at net asset value(d) | $ | 86,112 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Postretirement assets(d) | $ | 2,232 |  |  | $ | — |  |  | $ | 2,232 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Obligations under executive deferred compensation plan (a) | $ | 22,037 |  |  | $ | 22,037 |  |  | $ | — |  |  | $ | — |
Foreign currency forward contracts(e) | $ | 182 |  |  | $ | — |  |  | $ | 182 |  |  | $ | — |
(a) | 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.
(b) | 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 (expenses) income, net, in our consolidated statements of income.
(c) | 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. The fair value amounts of $5.1 million and $5.5 million as of December 31, 2017 and 2016, respectively, are included in this table to permit reconciliation to the marketable equity securities presented in Note 10, “Investments.”
(d) | See Note 15 “Pension Plans and Other Postretirement Benefits” for further information about fair value measurements of our pension and postretirement plan assets.
(e) | 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.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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