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Fair value measurements (Tables)
 6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Available-for-sale securities Details of available-for-sale securities were as follows:
June 30, 2020CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$9,812  $239  $6  $10,045  
U.S. Treasury securities1,170  7  —  1,177  
Total$10,982  $246  $6  $11,222  
June 30, 2019CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$10,771  $94  $35  $10,830  
U.S. Treasury securities180  —  —  180  
Total$10,951  $94  $35  $11,010  
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  $11,110  
Assets and liabilities measured at fair value on a recurring basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at June 30, 2020, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at June 30, 2020
 (In thousands)
Assets:    
Money market funds$—  $8,478  $—  $8,478  
Insurance contract*—  92,413  —  92,413  
Available-for-sale securities:
Mortgage-backed securities—  10,045  —  10,045  
U.S. Treasury securities—  1,177  —  1,177  
Total assets measured at fair value$—  $112,113  $—  $112,113  
* The insurance contract invests approximately 38 percent in fixed-income investments, 23 percent in common stock of large-cap companies, 9 percent in common stock of mid-cap companies, 9 percent in common stock of small-cap companies, 4 percent in target date investments and 17 percent in cash equivalents.
 Fair Value Measurements at June 30, 2019, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at June 30, 2019
 (In thousands)
Assets:    
Money market funds$—  $10,816  $—  $10,816  
Insurance contract*—  83,134  —  83,134  
Available-for-sale securities:
Mortgage-backed securities—  10,830  —  10,830  
U.S. Treasury securities—  180  —  180  
Total assets measured at fair value$—  $104,960  $—  $104,960  
* The insurance contract invests approximately 51 percent in fixed-income investments, 22 percent in common stock of large-cap companies, 12 percent in common stock of mid-cap companies, 10 percent in common stock of small-cap companies, 4 percent in target date investments and 1 percent in cash equivalents.
 Fair Value Measurements at December 31, 2019, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2019
 (In thousands)
Assets:    
Money market funds$—  $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:
 June 30, 2020June 30, 2019December 31, 2019
 (In thousands)
Carrying amount$2,281,876  $2,379,806  $2,243,107  
Fair value$2,563,734  $2,521,325  $2,418,631