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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities
Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands):
 
 
December 31, 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
$
314,982

 
$
333

 
$
(2,367
)
 
$
312,948

 
$
441,315

 
$
509

 
$
(2,760
)
 
$
439,064

Corporate securities
612,698

 
116

 
(4,156
)
 
608,658

 
810,444

 
268

 
(3,020
)
 
807,692

Municipal securities
2,500

 
4

 
—

 
2,504

 
3,965

 
2

 
(2
)
 
3,965

Government securities
234,668

 
91

 
(935
)
 
233,824

 
367,595

 
44

 
(1,516
)
 
366,123

Total
$
1,164,848

 
$
544

 
$
(7,458
)
 
$
1,157,934

 
$
1,623,319

 
$
823

 
$
(7,298
)
 
$
1,616,844