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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income attributable to common shareholders $ 282,299 $ 253,320
Noncontrolling interest in subsidiaries' earnings (47) 2
Net income 282,252 253,322
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 727 820
Amortization of bond premium and discount (42,421) (64,542)
Reorganization items 2,059 2,461
Deferred income taxes (46)  
Current income taxes 496 300
Deferred acquisition costs 6,854 4,509
Unearned premiums, net (147,095) (146,928)
Losses and loss expenses, net (78,527) 9,785
Ceded premiums payable (2,442) (15,912)
Investment income due and accrued 5,798 5,497
Premium receivables 77,523 110,943
Accrued interest payable 17,543 26,684
Net mark-to-market (gains) losses (10,278) 10,476
Net realized investment gains (46,060) (392)
Other-than-temporary impairment charges   3,071
Variable interest entity activities (38,326) (15,220)
Other, net 49,273 (144,524)
Net cash provided by operating activities 77,330 40,350
Cash flows from investing activities:    
Proceeds from sales of bonds 120,603 35,024
Proceeds from matured bonds 255,664 208,133
Purchases of bonds (243,006) (182,008)
Other investments, net (113,712)  
Change in short-term investments (106,274) (110,751)
Loans, net 512 (247)
Change in swap collateral receivable 1,740 41,046
Other, net 20,508 85
Net cash used in investing activities (63,965) (8,718)
Cash flows from financing activities:    
Paydowns of variable interest entity secured borrowing (4,067) (7,280)
Payments for investment and repurchase agreement draws   (420)
Net cash used in financing activities (4,067) (7,700)
Net cash flow 9,298 23,932
Cash at January 1 43,837 15,999
Cash at March 31 53,135 39,931
Supplemental disclosure of cash flow information:    
Income taxes 229  
Interest on variable interest entity secured borrowing 218 429
Interest on investment agreements 1,724 3,072
Cash receipts and payments related to reorganization items:    
Professional fees paid for services rendered in connection with the Chapter 11 proceeding $ 3,246 $ 1,641