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Investments (Tables)
 3 Months Ended
Mar. 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):
 
 
March 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
$
656,187

 
$
5,429

 
$
(313
)
 
$
661,303

 
$
641,997

 
$
4,506

 
$
(279
)
 
$
646,224

Corporate securities
458,432

 
1,059

 
(407
)
 
459,084

 
392,365

 
618

 
(1,190
)
 
391,793

Municipal securities
69,910

 
84

 
(16
)
 
69,978

 
80,004

 
57

 
(35
)
 
80,026

Government securities
27,274

 
185

 
(5
)
 
27,454

 
26,056

 
206

 
—

 
26,262

Total
$
1,211,803

 
$
6,757

 
$
(741
)
 
$
1,217,819

 
$
1,140,422

 
$
5,387

 
$
(1,504
)
 
$
1,144,305