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Investments in Equity Securities (Tables)
 6 Months Ended
Jun. 30, 2019
Equity securities  
Debt Securities, Available-for-sale [Line Items]  
Schedule of Investments in Equity Securities
At June 30, 2019 and December 31, 2018, investments in equity securities were as follows:
 
(In thousands)
Cost
 
Gross Unrealized
 
Fair
Value
 
Carrying
Value
Gains
 
Losses
 
June 30, 2019
 
 
 
 
 
 
 
 
 
Common stocks
$
153,440

 
$
8,092

 
$
(21,306
)
 
$
140,226

 
$
140,226

Preferred stocks
101,423

 
180,316

 
(5,377
)
 
276,362

 
276,362

Total
$
254,863

 
$
188,408

 
$
(26,683
)
 
$
416,588

 
$
416,588

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