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Investments in Equity Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Equity securities  
Debt Securities, Available-for-sale [Line Items]  
Schedule of Investments in Equity Securities
At September 30, 2019 and December 31, 2018, investments in equity securities were as follows:
 
(In thousands)
Cost
 
Gross Unrealized
 
Fair
Value
 
Carrying
Value
Gains
 
Losses
 
September 30, 2019
 
 
 
 
 
 
 
 
 
Common stocks
$
166,689

 
$
14,839

 
$
(33,467
)
 
$
148,061

 
$
148,061

Preferred stocks
111,014

 
188,489

 
(3,910
)
 
295,593

 
295,593

Total
$
277,703

 
$
203,328

 
$
(37,377
)
 
$
443,654

 
$
443,654

 
 
 
 
 
 
 
 
 
 
December 31, 2018
 
 
 
 
 
 
 
 
 
Common stocks
$
113,576

 
$
4,335

 
$
(19,719
)
 
$
98,192

 
$
98,192

Preferred stocks
115,201

 
72,364

 
(6,751
)
 
180,814

 
180,814

Total
$
228,777

 
$
76,699

 
$
(26,470
)
 
$
279,006

 
$
279,006