Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Reclassifications out of Accumulated Other Comprehensive Income (Details)

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Stockholders' Equity Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Gain (Loss) on Investments, Excluding Other than Temporary Impairments $ (363,379) $ (87,201) $ 54,608
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 535 392 1,662
Gain (Loss) on Investments, Excluding Other than Temporary Impairments (336,230) (52,931) 44,780
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (335,695) $ (52,539) $ 46,442