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Investments (Tables)
 12 Months Ended
Dec. 31, 2011
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, 2011
 
December 31, 2010
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
$
641,997

 
$
4,506

 
$
(279
)
 
$
646,224

 
$
728,177

 
$
2,134

 
$
(780
)
 
$
729,531

Corporate securities
392,365

 
618

 
(1,190
)
 
391,793

 
453,279

 
933

 
(1,107
)
 
453,105

Municipal securities
80,004

 
57

 
(35
)
 
80,026

 
28,681

 
8

 
(30
)
 
28,659

Government securities
26,056

 
206

 
—

 
26,262

 
77,976

 
245

 
(19
)
 
78,202

Total
$
1,140,422

 
$
5,387

 
$
(1,504
)
 
$
1,144,305

 
$
1,288,113

 
$
3,320

 
$
(1,936
)
 
$
1,289,497