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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

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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