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Investments (Tables)
 9 Months Ended
Sep. 30, 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):
 
 
September 30, 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
$
521,432

 
$
3,570

 
$
(30
)
 
$
524,972

 
$
641,997

 
$
4,506

 
$
(279
)
 
$
646,224

Corporate securities
505,156

 
1,212

 
(139
)
 
506,229

 
392,365

 
618

 
(1,190
)
 
391,793

Municipal securities
29,393

 
27

 
(1
)
 
29,419

 
80,004

 
57

 
(35
)
 
80,026

Government securities
21,368

 
137

 
—

 
21,505

 
26,056

 
206

 
—

 
26,262

Total
$
1,077,349

 
$
4,946

 
$
(170
)
 
$
1,082,125

 
$
1,140,422

 
$
5,387

 
$
(1,504
)
 
$
1,144,305