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Consolidated Statements of Total Comprehensive Loss (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Revenues: |  |
Net premiums earned | $ 414,604 | $ 405,970
Net investment income | 382,902 | 354,796
Other-than-temporary impairments: |  |
Total other-than-temporary impairment losses | (15,659) | (90,356)
Portion of loss recognized in other comprehensive income | 9,669 | 26,513
Net other-than-temporary impairment losses recognized in earnings | (5,990) | (63,843)
Net realized investment gains | 72,101 | 17,347
Change in fair value of credit derivatives: |  |
Realized gains and other settlements | 13,713 | 17,001
Unrealized (losses) gains | (22,932) | 31,031
Net change in fair value of credit derivatives | (9,219) | 48,032
Derivative products | (125,004) | (280,824)
Net realized (losses) gains on extinguishment of debt | (177,580) | 3,119
Other income | 106,098 | 25,535
Income (loss) on variable interest entities | 27,777 | (214,368)
Total revenues before expenses and reorganization items | 685,689 | 295,764
Expenses: |  |
Losses and loss expenses | 683,630 | 1,859,455
Underwriting and operating expenses | 139,029 | 141,305
Interest expense | 112,320 | 128,092
Total expenses before reorganization items | 934,979 | 2,128,852
Pre-tax loss from continuing operations before reorganization items | (249,290) | (1,833,088)
Reorganization items | 7,215 | 49,861
Pre-tax loss from continuing operations | (256,505) | (1,882,949)
Provision for income taxes | 2,849 | 77,422
Net loss | (259,354) | (1,960,371)
Less: net (loss) gain attributable to the noncontrolling interest | (2,676) | 60
Net loss attributable to common shareholders. | (256,678) | (1,960,431)
Other comprehensive income, after tax: |  |
Net loss | (259,354) | (1,960,371)
Unrealized gains on securities, net of deferred income taxes of $0 | 221,150 | 120,637
Less: reclassification adjustment for net gain (loss) included in net loss, net of tax of $0 | 54,898 | (48,614)
(Loss) gain on foreign currency translation, net of deferred income taxes of $0 | (540) | 1,528
Amortization of postretirement benefit, net of tax of $0 | (3,792) | 753
Total other comprehensive income, net of tax | 161,920 | 171,532
Total comprehensive loss | (97,434) | (1,788,839)
Less: comprehensive (loss) income attributable to the noncontrolling interest: |  |
Net (loss) income | (2,676) | 60
Currency translation adjustments | (206) | 47
Total comprehensive loss attributable to Ambac Financial Group, Inc. | $ (94,552) | $ (1,788,946)
Loss per share attributable to Ambac Financial Group, Inc. common shareholders | $ (0.85) | $ (6.48)
Loss per diluted share attributable to Ambac Financial Group, Inc. common shareholders | $ (0.85) | $ (6.48)
Weighted-average number of common shares outstanding: |  |
Basic | 302,468,867 | 302,439,299
Diluted | 302,468,867 | 302,439,299

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