Investments - Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses) on investments	$ (47)	$ 5,092	$ (211)	$ 8,984
Realized investment gains (losses) on investments:
Gains on sales	32	6,168	861	11,677
Losses on sales	(79)	(1,076)	(1,072)	(2,693)
Net realized investment (losses) gains	(47)	5,092	(211)	8,984
Fixed maturities
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses) on investments	(50)	1,511	(227)	5,397
Realized investment gains (losses) on investments:
Net realized investment (losses) gains	(50)	1,511	(227)	5,397
Equity securities
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses) on investments	3	3,581	16	3,587
Realized investment gains (losses) on investments:
Net realized investment (losses) gains	$ 3	$ 3,581	$ 16	$ 3,587

- Definition

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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