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Fair value measurements (Tables)
 9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Available-for-sale securities Details of available-for-sale securities were as follows:
September 30, 2020CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$9,813 $213 $4 $10,022 
U.S. Treasury securities1,166 3 — 1,169 
Total$10,979 $216 $4 $11,191 
September 30, 2019CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$9,577 $86 $16 $9,647 
U.S. Treasury securities1,258 — 1 1,257 
Total$10,835 $86 $17 $10,904 
December 31, 2019CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$9,804 $87 $10 $9,881 
U.S. Treasury securities1,228 1 — 1,229 
Total$11,032 $88 $10 $11,110 
Assets and liabilities measured at fair value on a recurring basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at September 30, 2020, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at September 30, 2020
(In thousands)
Assets:    
Money market funds$— $8,478 $— $8,478 
Insurance contract*— 95,687 — 95,687 
Available-for-sale securities:
Mortgage-backed securities— 10,022 — 10,022 
U.S. Treasury securities— 1,169 — 1,169 
Total assets measured at fair value$— $115,356 $— $115,356 
*    The insurance contract invests approximately 68 percent in fixed-income investments, 15 percent in common stock of large-cap companies, 6 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 4 percent in target date investments and 1 percent in cash equivalents.
 Fair Value Measurements at September 30, 2019, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at September 30, 2019
(In thousands)
Assets:    
Money market funds$— $7,472 $— $7,472 
Insurance contract*— 84,222 — 84,222 
Available-for-sale securities:
Mortgage-backed securities— 9,647 — 9,647 
U.S. Treasury securities— 1,257 — 1,257 
Total assets measured at fair value$— $102,598 $— $102,598 
*    The insurance contract invests approximately 53 percent in fixed-income investments, 21 percent in common stock of large-cap companies, 11 percent in common stock of mid-cap companies, 10 percent in common stock of small-cap companies, 3 percent in target date investments and 2 percent in cash equivalents.
 Fair Value Measurements at December 31, 2019, Using 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2019
(In thousands)
Assets:    
Money market funds$— $8,440 $— $8,440 
Insurance contract*— 87,009 — 87,009 
Available-for-sale securities:
Mortgage-backed securities— 9,881 — 9,881 
U.S. Treasury securities— 1,229 — 1,229 
Total assets measured at fair value$— $106,559 $— $106,559 
*    The insurance contract invests approximately 51 percent in fixed-income investments, 23 percent in common stock of large-cap companies, 12 percent in common stock of mid-cap companies, 10 percent in common stock of small-cap companies, 3 percent in target date investments and 1 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:
 September 30, 2020September 30, 2019December 31, 2019
(In thousands)
Carrying amount$2,270,290 $2,246,756 $2,243,107 
Fair value$2,593,743 $2,450,209 $2,418,631