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Investments (Tables)
 3 Months Ended
Mar. 31, 2019
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):
 
 
March 31, 2019
 
December 31, 2018
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
$
69,987

 
$
249

 
$
(289
)
 
$
69,947

 
$
314,982

 
$
333

 
$
(2,367
)
 
$
312,948

Corporate securities
118,689

 
99

 
(490
)
 
118,298

 
612,698

 
116

 
(4,156
)
 
608,658

Municipal securities
—

 
—

 
—

 
—

 
2,500

 
4

 
—

 
2,504

Government securities
72,000

 
22

 
(326
)
 
71,696

 
234,668

 
91

 
(935
)
 
233,824

Total
$
260,676

 
$
370

 
$
(1,105
)
 
$
259,941

 
$
1,164,848

 
$
544

 
$
(7,458
)
 
$
1,157,934