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Investments (Net Realized Investment Gains (Losses)) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) Issuer	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Gain (Loss) on Investments [Line Items]
OTTI losses	$ (419)	$ (10,734)
Portion of OTTI losses recognized in other comprehensive income before taxes	248	1,068
Net impairment losses recognized in earnings	(171)	(9,666)
Gross realized gains, available-for-sale securities	1,853	3,185
Gross realized (losses), available-for-sale securities	(67)	(4,647)
Net realized gains (losses), trading securities	6,562	2,055
Net realized gains (losses), Other investments	1,172	52
Change in unrealized holding gains (losses), trading securities	3,616	733
Change in unrealized holding gains (losses), convertible securities, carried at fair value	313	(66)
Other	2	2
Total net realized investment gains (losses)	13,280	(8,352)
Credit-related other-than-temporary impairment recognized in earnings	1,329	6,559	$ 1,158	$ 5,751
Corporate debt [Member]
Gain (Loss) on Investments [Line Items]
OTTI losses	(419)	(7,604)
Portion of OTTI losses recognized in other comprehensive income before taxes	248	$ 1,068
Credit-related other-than-temporary impairment recognized in earnings			$ 5,500
Debt securities, number of issuers | Issuer		10
Other investments [Member]
Gain (Loss) on Investments [Line Items]
OTTI losses	$ 0	$ (3,130)
Net impairment losses recognized in earnings		$ (3,100)

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Debt Securities, Number of Issuers

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity.

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