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Fair value measurements
3 Months Ended
Mar. 31, 2021
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 insurance contracts, to satisfy its obligations under its unfunded, nonqualified defined benefit and defined contribution 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 $101.6 million, $83.3 million and $100.1 million, at March 31, 2021 and 2020, and December 31, 2020, respectively, are classified as investments on the Consolidated Balance Sheets. The net unrealized gains on these investments was $127,000 for the three months ended March 31, 2021. The net unrealized loss on these investments was $3.7 million for the three months ended March 31, 2020. 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.
The Company did not elect the fair value option, which records gains and losses in income, for its available-for-sale securities, which 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:
March 31, 2021CostGross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
(In thousands)
Mortgage-backed securities$8,709 $155 $10 $8,854 
U.S. Treasury securities2,636 — 14 2,622 
Total$11,345 $155 $24 $11,476 
March 31, 2020CostGross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
(In thousands)
Mortgage-backed securities$9,691 $236 $— $9,927 
U.S. Treasury securities1,173 12 — 1,185 
Total$10,864 $248 $— $11,112 
December 31, 2020CostGross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
(In thousands)
Mortgage-backed securities$9,799 $156 $$9,946 
U.S. Treasury securities1,386 — 1,381 
Total$11,185 $156 $14 $11,327 
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 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 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 insurance contracts are 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.
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at March 31, 2021, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Balance at March 31, 2021
(In thousands)
Assets:    
Money market funds$9,388 $— $9,388 
Insurance contracts*— 101,632 101,632 
Available-for-sale securities:
Mortgage-backed securities— 8,854 — 8,854 
U.S. Treasury securities— 2,622 — 2,622 
Total assets measured at fair value$— $122,496 $— $122,496 
*    The insurance contracts invest approximately 54 percent in fixed-income investments, 19 percent in common stock of large-cap companies, 10 percent in common stock of mid-cap companies, 9 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.
 Fair Value Measurements at March 31, 2020, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Balance at March 31, 2020
(In thousands)
Assets:    
Money market funds$— $8,470 $— $8,470 
Insurance contract*— 83,254 — 83,254 
Available-for-sale securities:
Mortgage-backed securities— 9,927 — 9,927 
U.S. Treasury securities— 1,185 — 1,185 
Total assets measured at fair value$— $102,836 $— $102,836 
*    The insurance contract invests approximately 58 percent in fixed-income investments, 20 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 8 percent in common stock of small-cap companies, 4 percent in target date investments and 2 percent in cash equivalents.
 Fair Value Measurements at December 31, 2020, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
 (Level 3)
Balance at December 31, 2020
(In thousands)
Assets:    
Money market funds$— $8,917 $— $8,917 
Insurance contract*— 100,104 — 100,104 
Available-for-sale securities:
Mortgage-backed securities— 9,946 — 9,946 
U.S. Treasury securities— 1,381 — 1,381 
Total assets measured at fair value$— $120,348 $— $120,348 
*    The insurance contract invests approximately 57 percent in fixed-income investments, 18 percent in common stock of large-cap companies, 9 percent in common stock of mid-cap companies, 9 percent in common stock of small-cap companies, 5 percent in target date investments and 2 percent in cash equivalents.
The Company applies the provisions of the fair value measurement standard to its nonrecurring, non-financial measurements, including long-lived asset impairments. These assets are not measured at fair value on an ongoing basis but are subject to fair value adjustments only in certain circumstances. The Company reviews the carrying value of its long-lived assets, excluding goodwill, whenever events or changes in circumstances indicate that such carrying amounts may not be recoverable.
The Company performed fair value assessments of the assets acquired and liabilities assumed in the business combinations that occurred during 2020. The fair value of these assets and liabilities were determined based on Level 2 and Level 3 inputs.
The estimated fair value of the Company's Level 2 commodity derivative instruments is based on futures prices, volatility and time to maturity, among other things. Counterparty statements are utilized to determine the value of the commodity derivative instruments and are reviewed and corroborated using various methodologies and significant observable inputs. The Company's and the counterparties' nonperformance risk is also evaluated.
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 categorized as Level 2 in the fair value hierarchy and 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:
 March 31, 2021March 31, 2020December 31, 2020
(In thousands)
Carrying amount$2,253,274 $2,455,235 $2,213,130 
Fair value$2,473,806 $2,618,297 $2,537,289 
The carrying amounts of the Company's remaining financial instruments included in current assets and current liabilities approximate their fair values.