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Investments in Equity Securities Available for Sale (Tables)
9 Months Ended
Sep. 30, 2017
Equity securities available for sale  
Schedule of Available-for-sale Securities [Line Items]  
Schedule of Investments in Equity Securities
At September 30, 2017 and December 31, 2016, investments in equity securities were as follows:
 
(In thousands)
Cost
 
Gross Unrealized
 
Fair
Value
 
Carrying
Value
Gains
 
Losses
 
September 30, 2017
 
 
 
 
 
 
 
 
 
Common stocks
$
83,709

 
$
339,297

 
$
(3,486
)
 
$
419,520

 
$
419,520

Preferred stocks
125,076

 
71,147

 
(1,718
)
 
194,505

 
194,505

Total
$
208,785

 
$
410,444

 
$
(5,204
)
 
$
614,025

 
$
614,025

December 31, 2016
 
 
 
 
 
 
 
 
 
Common stocks
$
94,998

 
$
351,906

 
$
(1,046
)
 
$
445,858

 
$
445,858

Preferred stocks
125,589

 
101,392

 
(3,639
)
 
223,342

 
223,342

Total
$
220,587

 
$
453,298

 
$
(4,685
)
 
$
669,200

 
$
669,200