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Shareholders' Equity (AOCI Reclassification) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Reclassifications from AOCI to Net income: |  |  |
Deferred tax expense (benefit) included in OCI | $ 1,481 | $ 12,260 |
Tax rate used to compute the tax effect of amounts reclassified out of OCI | 35.00% |  | 35.00%
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassifications from AOCI to Net income: |  |  |
Reclassification amount, before tax effect | $ 1,616 | (7,999) |
Tax effect (at 35%) | (566) | 2,800 |
Net reclassification adjustments | 1,050 | (5,199) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Realized investment gains (losses) [Member] |  |  |
Reclassifications from AOCI to Net income: |  |  |
Reclassification amount, before tax effect | 1,616 | (5,241) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Non-credit impairment losses reclassified to earnings, due to sale of securities or reclassification as a credit loss [Member] |  |  |
Reclassifications from AOCI to Net income: |  |  |
Reclassification amount, before tax effect | $ 0 | $ (2,758) |

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