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Summary of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense and other financial losses | $ (5,684) | $ (4,950)
Income / asset tax gain | (6,956) | (14,655)
Net income | 30,247 | $ 1,721
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized (Losses) Gains on Investments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense and other financial losses | (1,023) |
Income / asset tax gain | 351 |
Net income | $ (672) |

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