| Schedule of Quarterly Financial Information [Table Text Block] |
Quarterly Financial Data (Unaudited) | | | | | | | | | | | | | | | | | | | | | (In thousands, except per share information) | 2013 Quarters | | First | | Second | | Third | | Fourth | | Year | Net premiums earned—insurance | $ | 192,588 |
| | $ | 213,124 |
| | $ | 211,984 |
| | $ | 213,198 |
| | $ | 830,894 |
| Net investment income | 26,873 |
| | 27,615 |
| | 26,732 |
| | 26,868 |
| | 108,088 |
| Net losses on investments (1) | (5,505 | ) | | (130,254 | ) | | (7,132 | ) | | (6,829 | ) | | (149,720 | ) | Net change in fair value of derivative instruments (2) | (167,670 | ) | | 86,535 |
| | 10,778 |
| | 38,586 |
| | (31,771 | ) | Net (losses) gains on other financial instruments (3) | (5,675 | ) | | 1,188 |
| | 902 |
| | (1,151 | ) | | (4,736 | ) | Provision for losses (4) | 132,059 |
| | 140,291 |
| | 157,174 |
| | 137,610 |
| | 567,134 |
| Policy acquisition and other operating expenses | 97,295 |
| | 70,987 |
| | 78,932 |
| | 78,978 |
| | 326,192 |
| Net (loss) income (5) | (187,500 | ) | | (33,172 | ) | | (12,682 | ) | | 36,369 |
| | (196,985 | ) | Diluted net (loss) income per share (6)(7) | $ | (1.30 | ) | | $ | (0.19 | ) | | $ | (0.07 | ) | | $ | 0.19 |
| | $ | (1.18 | ) | Weighted average shares outstanding (6) | 144,355 |
| | 171,783 |
| | 171,830 |
| | 213,504 |
| | 166,366 |
| | | | | | | | | | | | 2012 Quarters | | First | | Second | | Third | | Fourth | | Year | Net premiums earned—insurance | $ | 167,365 |
| | $ | 186,779 |
| | $ | 190,963 |
| | $ | 193,875 |
| | $ | 738,982 |
| Net investment income | 34,713 |
| | 30,877 |
| | 25,635 |
| | 23,112 |
| | 114,337 |
| Net gains on investments (1) | 67,459 |
| | 26,419 |
| | 84,659 |
| | 6,351 |
| | 184,888 |
| Net change in fair value of derivative instruments (2) | (72,757 | ) | | (33,124 | ) | | (41,056 | ) | | 2,912 |
| | (144,025 | ) | Net losses on other financial instruments (3) | (17,852 | ) | | (61,862 | ) | | (740 | ) | | (1,815 | ) | | (82,269 | ) | Provision for losses (4) | 266,154 |
| | 210,868 |
| | 176,352 |
| | 305,797 |
| | 959,171 |
| Policy acquisition and other operating expenses | 78,200 |
| | 50,998 |
| | 63,356 |
| | 65,994 |
| | 258,548 |
| Net (loss) income | (169,232 | ) | | (119,259 | ) | | 14,325 |
| | (177,302 | ) | | (451,468 | ) | Diluted net (loss) income per share (6)(7) | $ | (1.28 | ) | | $ | (0.90 | ) | | $ | 0.11 |
| | $ | (1.34 | ) | | $ | (3.41 | ) | Weighted average shares outstanding (6) | 132,465 |
| | 132,346 |
| | 134,033 |
| | 132,525 |
| | 132,533 |
|
______________ | | (1) | The 2013 and 2012 amounts reflect unrealized (losses) gains, respectively, on our trading securities. The 2012 amounts also reflect realized gains (losses) on investments in connection with the continued reallocation of our investment portfolio. |
| | (2) | The change in fair value of derivative instruments for 2013 and 2012 reflects the volatility in the cumulative unrealized (loss) gain attributable to the market’s perception of our non-performance risk as a result of the changes in our CDS spread during both years. The 2013 amounts also reflect improvements in the credit spreads of the underlying securities. |
| | (3) | The 2013 and 2012 periods primarily reflect fair value gains and losses on our VIE debt. |
| | (4) | The results for 2013 reflect a continued decline in new defaults and positive development in our estimate of future losses on existing defaults. The results for the fourth quarter of 2012 include the effects of an increase in our IBNR reserve estimate. |
| | (5) | Net income in the fourth quarter of 2013 reflects unrealized gains in the change in fair value of derivative instruments and a decline in the provision for losses in our mortgage insurance segment. |
| | (6) | Diluted net (loss) income per share and average shares outstanding per the accounting standard regarding earnings per share. |
| | (7) | Net (loss) income per share is computed independently for each period presented. Consequently, the sum of the quarters may not equal the total net (loss) income per share for the year. |
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