Statements of Operations - USD ($) $ in Thousands	12 Months Ended
Statements of Operations - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net investment income	$ 255,010	$ 263,746	$ 259,048
Net investment gains (losses):
Net realized investment gains	279,435	167,262	222,943
Change in net unrealized investment gains	(603,326)	664,844	(1,387,168)
Total net investment gains (losses)	(323,891)	832,106	(1,164,225)
Net increase (decrease) in net assets resulting from operations	$ (68,881)	$ 1,095,852	$ (905,177)

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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