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Fair value measurements (Tables)
 3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Available-for-sale securities 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 $9,946 
U.S. Treasury securities1,386 — 5 1,381 
Total$11,185 $156 $14 $11,327 
Assets and liabilities measured at fair value on a recurring basis
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.
Fair value of long term debt outstanding 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