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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Data [Abstract]  
Summary Of Quarterly Financial Data
Summarized quarterly financial data for 2012 and 2011 are as follows:
 
 
Quarter Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(Amounts in thousands, except per share data)
 
2012
 
 
 
 
 
 
 
 
Net premiums earned
$
635,812

 
$
637,247

 
$
646,084

  
$
655,777

 
Change in fair value of investments pursuant to the fair value option
$
49,343

 
$
(24,788
)
 
$
44,783


$
(23,829
)
 
Income (loss) before income taxes
$
101,994

 
$
(18,853
)
 
$
91,330


$
(39,161
)
 
Net income (loss)
$
73,356

 
$
(5,264
)
 
$
66,201


$
(17,382
)
 
Basic earnings per share
$
1.34

 
$
(0.10
)
 
$
1.21


$
(0.32
)
 
Diluted earnings per share
$
1.34

 
$
(0.10
)
(1) 
$
1.21

 
$
(0.32
)
(1) 
Dividends paid per share
$
0.61

 
$
0.61

 
$
0.61

  
$
0.6125

 
2011
 
 
 
 
 
 
 
 
Net premiums earned
$
638,487

 
$
642,331

 
$
643,626

  
$
641,613

 
Change in fair value of investments pursuant to the fair value option
$
20,904

 
$
20,597

 
$
(64,312
)

$
54,100

 
Income (loss) before income taxes
$
76,911

 
$
75,613

 
$
(18,118
)

$
110,693

 
Net income (loss)
$
58,226

 
$
57,251

 
$
(3,782
)

$
79,469

 
Basic earnings per share
$
1.06

 
$
1.04

 
$
(0.07
)

$
1.45

 
Diluted earnings per share
$
1.06

 
$
1.04

 
$
(0.07
)
(1) 
$
1.45

 
Dividends paid per share
$
0.60

 
$
0.60

 
$
0.60

  
$
0.61

 
 __________
(1)
The dilutive impact of incremental shares is excluded from loss position in accordance with GAAP.