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Investments (Tables)
9 Months Ended
Sep. 30, 2014
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):
 
 
September 30, 2014
 
December 31, 2013
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
$
644,491

 
$
1,392

 
$
(539
)
 
$
645,344

 
$
453,922

 
$
1,177

 
$
(349
)
 
$
454,750

Corporate securities
768,474

 
540

 
(822
)
 
768,192

 
643,360

 
947

 
(216
)
 
644,091

Municipal securities
41,263

 
23

 
(13
)
 
41,273

 
53,698

 
81

 
(23
)
 
53,756

Government securities
122,851

 
36

 
(28
)
 
122,859

 
156,930

 
196

 
(47
)
 
157,079

Total
$
1,577,079

 
$
1,991

 
$
(1,402
)
 
$
1,577,668

 
$
1,307,910

 
$
2,401

 
$
(635
)
 
$
1,309,676