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Investments (Tables)
6 Months Ended
Jun. 30, 2017
Investments [Abstract]  
Schedule of investments in available-for-sale securities at fair values
Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands):
 
 
June 30, 2017
 
December 31, 2016
Description of the
Securities
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Agency securities
$
479,435

 
$
625

 
$
(1,293
)
 
$
478,767

 
$
411,963

 
$
699

 
$
(1,169
)
 
$
411,493

Corporate securities
805,137

 
509

 
(1,164
)
 
804,482

 
842,887

 
193

 
(2,114
)
 
840,966

Municipal securities
3,965

 
12

 

 
3,977

 
9,989

 
3

 
(4
)
 
9,988

Government securities
269,920

 
73

 
(743
)
 
269,250

 
445,083

 
135

 
(600
)
 
444,618

Total
$
1,558,457

 
$
1,219

 
$
(3,200
)
 
$
1,556,476

 
$
1,709,922

 
$
1,030

 
$
(3,887
)
 
$
1,707,065