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Investments (Tables)
 3 Months Ended
Mar. 31, 2013
Investments [Abstract]  
Schedule of investments in available-for-sale securities at fair values
Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands):
 
 
March 31, 2013
 
December 31, 2012
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
$
423,651

 
$
1,971

 
$
(143
)
 
$
425,479

 
$
400,365

 
$
2,347

 
$
(5
)
 
$
402,707

Corporate securities
568,298

 
1,004

 
(245
)
 
569,057

 
404,546

 
947

 
(171
)
 
405,322

Municipal securities
47,891

 
88

 
(7
)
 
47,972

 
32,214

 
114

 
(15
)
 
32,313

Government securities
110,892

 
92

 
(9
)
 
110,975

 
39,863

 
131

 
(1
)
 
39,993

Total
$
1,150,732

 
$
3,155

 
$
(404
)
 
$
1,153,483

 
$
876,988

 
$
3,539

 
$
(192
)
 
$
880,335