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Investments (Tables)
9 Months Ended
Sep. 30, 2015
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, 2015
 
December 31, 2014
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
$
577,539

 
$
1,422

 
$
(80
)
 
$
578,881

 
$
637,474

 
$
1,296

 
$
(457
)
 
$
638,313

Corporate securities
679,887

 
396

 
(928
)
 
679,355

 
795,255

 
232

 
(1,372
)
 
794,115

Municipal securities
15,466

 
28

 
(1
)
 
15,493

 
48,744

 
17

 
(31
)
 
48,730

Government securities
63,596

 
143

 

 
63,739

 
121,431

 
37

 
(256
)
 
121,212

Total
$
1,336,488

 
$
1,989

 
$
(1,009
)
 
$
1,337,468

 
$
1,602,904

 
$
1,582

 
$
(2,116
)
 
$
1,602,370