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Investments (Tables)
12 Months Ended
Dec. 31, 2015
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, 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
$
530,981

 
$
757

 
$
(1,216
)
 
$
530,522

 
$
637,474

 
$
1,296

 
$
(457
)
 
$
638,313

Corporate securities
699,210

 
90

 
(1,929
)
 
697,371

 
795,255

 
232

 
(1,372
)
 
794,115

Municipal securities
14,872

 
14

 
(8
)
 
14,878

 
48,744

 
17

 
(31
)
 
48,730

Government securities
152,376

 
9

 
(340
)
 
152,045

 
121,431

 
37

 
(256
)
 
121,212

Total
$
1,397,439

 
$
870

 
$
(3,493
)
 
$
1,394,816

 
$
1,602,904

 
$
1,582

 
$
(2,116
)
 
$
1,602,370