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Fair value measurements | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Fair value measurements | Fair value measurements The Company measures its investments in certain fixed-income and equity securities at fair value with changes in fair value recognized in income. The Company anticipates using these investments, which consist of an insurance contract, to satisfy its obligations under its unfunded, nonqualified benefit plans for executive officers and certain key management employees, and invests in these fixed-income and equity securities for the purpose of earning investment returns and capital appreciation. These investments, which totaled $80.4 million, $75.0 million and $77.4 million, at September 30, 2018 and 2017, and December 31, 2017, respectively, are classified as investments on the Consolidated Balance Sheets. The net unrealized gains on these investments were $2.1 million and $3.0 million for the three and nine months ended September 30, 2018, respectively. The net unrealized gains on these investments were $1.9 million and $6.9 million for the three and nine months ended September 30, 2017, respectively. The change in fair value, which is considered part of the cost of the plan, is classified in other income on the Consolidated Statements of Income. In connection with the adoption of ASU 2017-07, as discussed in Note 6, the Company has elected to reclassify prior period unrealized gains from operation and maintenance expense to other income on the Consolidated Statements of Income. The Company did not elect the fair value option, which records gains and losses in income, for its available-for-sale securities. The available-for-sale securities include mortgage-backed securities and U.S. Treasury securities. These available-for-sale securities are recorded at fair value and are classified as investments on the Consolidated Balance Sheets. Unrealized gains or losses are recorded in accumulated other comprehensive income (loss). Details of available-for-sale securities were as follows:
September 30, 2018 | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
| (In thousands)
Mortgage-backed securities | $ | 10,550 |  | $ | 3 |  | $ | 251 |  | $ | 10,302 |
U.S. Treasury securities | 179 |  | — |  | — |  | 179 |
Total | $ | 10,729 |  | $ | 3 |  | $ | 251 |  | $ | 10,481 |
September 30, 2017 | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
| (In thousands)
Mortgage-backed securities | $ | 9,488 |  | $ | 11 |  | $ | 72 |  | $ | 9,427 |
U.S. Treasury securities | 613 |  | — |  | 1 |  | 612 |
Total | $ | 10,101 |  | $ | 11 |  | $ | 73 |  | $ | 10,039 |
December 31, 2017 | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
| (In thousands)
Mortgage-backed securities | $ | 10,342 |  | $ | 4 |  | $ | 129 |  | $ | 10,217 |
U.S. Treasury securities | 205 |  | — |  | 1 |  | 204 |
Total | $ | 10,547 |  | $ | 4 |  | $ | 130 |  | $ | 10,421 |
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The fair value ASC establishes a hierarchy for grouping assets and liabilities, based on the significance of inputs. The estimated fair values of the Company's assets and liabilities measured on a recurring basis are determined using the market approach. The Company's Level 2 money market funds are valued at the net asset value of shares held at the end of the quarter, based on published market quotations on active markets, or using other known sources including pricing from outside sources. The estimated fair value of the Company's Level 2 mortgage-backed securities and U.S. Treasury securities are based on comparable market transactions, other observable inputs or other sources, including pricing from outside sources. The estimated fair value of the Company's Level 2 insurance contract is based on contractual cash surrender values that are determined primarily by investments in managed separate accounts of the insurer. These amounts approximate fair value. The managed separate accounts are valued based on other observable inputs or corroborated market data. Though the Company believes the methods used to estimate fair value are consistent with those used by other market participants, the use of other methods or assumptions could result in a different estimate of fair value. For the nine months ended September 30, 2018 and 2017, there were no transfers between Levels 1 and 2. The Company's assets and liabilities measured at fair value on a recurring basis were as follows:
| Fair Value Measurements at September 30, 2018, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance at September 30, 2018 |
| (In thousands)
Assets: |  |  |  |
Money market funds | $ | — |  | $ | 9,948 |  | $ | — |  | $ | 9,948 |
Insurance contract* | — |  | 80,358 |  | — |  | 80,358 |
Available-for-sale securities: |  |  |  |
Mortgage-backed securities | — |  | 10,302 |  | — |  | 10,302 |
U.S. Treasury securities | — |  | 179 |  | — |  | 179 |
Total assets measured at fair value | $ | — |  | $ | 100,787 |  | $ | — |  | $ | 100,787 |
* | The insurance contract invests approximately 47 percent in fixed-income investments, 24 percent in common stock of large-cap companies, 13 percent in common stock of mid-cap companies, 12 percent in common stock of small-cap companies, 3 percent in target date investments and 1 percent in cash equivalents.
| Fair Value Measurements at September 30, 2017, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance at September 30, 2017 |
| (In thousands)
Assets: |  |  |  |
Money market funds | $ | — |  | $ | 6,204 |  | $ | — |  | $ | 6,204 |
Insurance contract* | — |  | 74,991 |  | — |  | 74,991 |
Available-for-sale securities: |  |  |  |
Mortgage-backed securities | — |  | 9,427 |  | — |  | 9,427 |
U.S. Treasury securities | — |  | 612 |  | — |  | 612 |
Total assets measured at fair value | $ | — |  | $ | 91,234 |  | $ | — |  | $ | 91,234 |
* | The insurance contract invests approximately 50 percent in fixed-income investments, 23 percent in common stock of large-cap companies, 13 percent in common stock of mid-cap companies, 11 percent in common stock of small-cap companies, 2 percent in target date investments and 1 percent in cash equivalents.
| Fair Value Measurements at December 31, 2017, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance at December 31, 2017 |
| (In thousands)
Assets: |  |  |  |
Money market funds | $ | — |  | $ | 6,965 |  | $ | — |  | $ | 6,965 |
Insurance contract* | — |  | 77,388 |  | — |  | 77,388 |
Available-for-sale securities: |  |  |  |
Mortgage-backed securities | — |  | 10,217 |  | — |  | 10,217 |
U.S. Treasury securities | — |  | 204 |  | — |  | 204 |
Total assets measured at fair value | $ | — |  | $ | 94,774 |  | $ | — |  | $ | 94,774 |
* | The insurance contract invests approximately 49 percent in fixed-income investments, 23 percent in common stock of large-cap companies, 14 percent in common stock of mid-cap companies, 11 percent in common stock of small-cap companies, 2 percent in target date investments and 1 percent in cash equivalents.
The Company's long-term debt is not measured at fair value on the Consolidated Balance Sheets and the fair value is being provided for disclosure purposes only. The fair value was based on discounted future cash flows using current market interest rates. The estimated fair value of the Company's Level 2 long-term debt was as follows:
| Carrying Amount |  | Fair Value |
| (In thousands)
Long-term debt at September 30, 2018 | $ | 1,915,470 |  | $ | 1,987,360 |
Long-term debt at September 30, 2017 | $ | 1,740,552 |  | $ | 1,846,811 |
Long-term debt at December 31, 2017 | $ | 1,714,853 |  | $ | 1,826,256 |
The carrying amounts of the Company's remaining financial instruments included in current assets and current liabilities approximate their fair values.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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