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Investments in Equity Securities (Tables)
 3 Months Ended
Mar. 31, 2020
Equity securities  
Debt Securities, Available-for-sale [Line Items]  
Schedule of Investments in Equity Securities
At March 31, 2020 and December 31, 2019, investments in equity securities were as follows:
 
(In thousands)
Cost
 
Gross Unrealized
 
Fair
Value
 
Carrying
Value
Gains
 
Losses
 
March 31, 2020
 
 
 
 
 
 
 
 
 
Common stocks
$
200,427

 
$
6,718

 
$
(60,487
)
 
$
146,658

 
$
146,658

Preferred stocks
174,621

 
45,516

 
(10,693
)
 
209,444

 
209,444

Total
$
375,048

 
$
52,234

 
$
(71,180
)
 
$
356,102

 
$
356,102

 
 
 
 
 
 
 
 
 
 
December 31, 2019
 
 
 
 
 
 
 
 
 
Common stocks
$
175,928

 
$
16,967

 
$
(26,090
)
 
$
166,805

 
$
166,805

Preferred stocks
169,171

 
148,243

 
(3,599
)
 
313,815

 
313,815

Total
$
345,099

 
$
165,210

 
$
(29,689
)
 
$
480,620

 
$
480,620