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Investments (Tables)
6 Months Ended
Jun. 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):
 
 
June 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
$
543,345

 
$
1,413

 
$
(207
)
 
$
544,551

 
$
637,474

 
$
1,296

 
$
(457
)
 
$
638,313

Corporate securities
734,548

 
253

 
(1,003
)
 
733,798

 
795,255

 
232

 
(1,372
)
 
794,115

Municipal securities
30,961

 
42

 
(11
)
 
30,992

 
48,744

 
17

 
(31
)
 
48,730

Government securities
173,545

 
205

 
(4
)
 
173,746

 
121,431

 
37

 
(256
)
 
121,212

Total
$
1,482,399

 
$
1,913

 
$
(1,225
)
 
$
1,483,087

 
$
1,602,904

 
$
1,582

 
$
(2,116
)
 
$
1,602,370