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Investments (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018
 
December 31, 2017
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
$
371,079

 
$
431

 
$
(3,494
)
 
$
368,016

 
$
441,315

 
$
509

 
$
(2,760
)
 
$
439,064

Corporate securities
667,265

 
188

 
(5,283
)
 
662,170

 
810,444

 
268

 
(3,020
)
 
807,692

Municipal securities
2,500

 
8

 
—

 
2,508

 
3,965

 
2

 
(2
)
 
3,965

Government securities
281,495

 
9

 
(1,387
)
 
280,117

 
367,595

 
44

 
(1,516
)
 
366,123

Total
$
1,322,339

 
$
636

 
$
(10,164
)
 
$
1,312,811

 
$
1,623,319

 
$
823

 
$
(7,298
)
 
$
1,616,844