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Investments (Tables)
3 Months Ended
Mar. 31, 2016
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, 2016
 
December 31, 2015
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
$
540,090

 
$
1,057

 
$
(193
)
 
$
540,954

 
$
530,981

 
$
757

 
$
(1,216
)
 
$
530,522

Corporate securities
736,440

 
1,048

 
(645
)
 
736,843

 
699,210

 
90

 
(1,929
)
 
697,371

Municipal securities
3,889

 
22

 
(1
)
 
3,910

 
14,872

 
14

 
(8
)
 
14,878

Government securities
210,065

 
170

 
(4
)
 
210,231

 
152,376

 
9

 
(340
)
 
152,045

Total
$
1,490,484

 
$
2,297

 
$
(843
)
 
$
1,491,938

 
$
1,397,439

 
$
870

 
$
(3,493
)
 
$
1,394,816