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Investments (Tables)
 12 Months Ended
Dec. 31, 2012
Investments [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, 2012
 
December 31, 2011
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
$
400,365

 
$
2,347

 
$
(5
)
 
$
402,707

 
$
641,997

 
$
4,506

 
$
(279
)
 
$
646,224

Corporate securities
404,546

 
947

 
(171
)
 
405,322

 
392,365

 
618

 
(1,190
)
 
391,793

Municipal securities
32,214

 
114

 
(15
)
 
32,313

 
80,004

 
57

 
(35
)
 
80,026

Government securities
39,863

 
131

 
(1
)
 
39,993

 
26,056

 
206

 
—

 
26,262

Total
$
876,988

 
$
3,539

 
$
(192
)
 
$
880,335

 
$
1,140,422

 
$
5,387

 
$
(1,504
)
 
$
1,144,305