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Summary of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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