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Investments in Equity Securities Available for Sale
 6 Months Ended
Jun. 30, 2017
Equity securities available for sale  
Schedule of Available-for-sale Securities [Line Items]  
Investments in Equity Securities Available for Sale
Investments in Equity Securities Available for Sale
At June 30, 2017 and December 31, 2016, investments in equity securities were as follows:
 
(In thousands)
Cost
 
Gross Unrealized
 
Fair
Value
 
Carrying
Value
Gains
 
Losses
 
June 30, 2017
 
 
 
 
 
 
 
 
 
Common stocks
$
87,185

 
$
366,106

 
$
(5,691
)
 
$
447,600

 
$
447,600

Preferred stocks
119,083

 
47,208

 
(1,084
)
 
165,207

 
165,207

Total
$
206,268

 
$
413,314

 
$
(6,775
)
 
$
612,807

 
$
612,807

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