Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Gain (Loss) on Investments, Excluding Other than Temporary Impairments $ 52,352 $ (29,474)
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 0 717
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 9,313 (19,126)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 9,313 $ (18,409)