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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Reclassification out of Accumulated Other Comprehensive Income | Mar. 31, 2013 Reclassification out of Accumulated Other Comprehensive Income | Mar. 31, 2014 Accumulated Net Unrealized Investment Gain (Loss) | Dec. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss) | Mar. 31, 2014 Accumulated Net Unrealized Investment Gain (Loss) Reclassification out of Accumulated Other Comprehensive Income | Mar. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss) Reclassification out of Accumulated Other Comprehensive Income | Mar. 31, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Dec. 31, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Mar. 31, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges Reclassification out of Accumulated Other Comprehensive Income | Mar. 31, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges Reclassification out of Accumulated Other Comprehensive Income | Mar. 31, 2014 Other comprehensive income loss before reclassifications Accumulated Net Unrealized Investment Gain (Loss) | Mar. 31, 2013 Other comprehensive income loss before reclassifications Accumulated Net Unrealized Investment Gain (Loss) | Mar. 31, 2014 Other comprehensive income loss before reclassifications Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Mar. 31, 2013 Other comprehensive income loss before reclassifications Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense) | $ (5,601) | $ (14,457) |  |  |  |  | $ 100 | $ 4,100 |  |  |  |  |  |  |  |
Income tax benefit (expense) | 178,414 | 65,508 |  |  | 4,300 | 3,300 | 0 | (1,400) | 300 | 100 | 400 | (100) | 1,100 | 700 | 100 | 1,600
Revenues | 2,129,751 | 1,415,096 |  |  |  |  |  |  |  |  | (4,700) | 1,100 |  |  |  |
Net income | $ 479,728 | $ 426,749 | $ (4,200) | $ 3,700 |  |  |  |  |  |  |  |  |  |  |  |

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