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Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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Investments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
Investments (Narrative) (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Investment [Line Items]
Securities Sold under Agreements to Repurchase	$ 0		$ 0		$ 0
Commercial mortgage loans, Percentage	100.00%		100.00%		100.00%
Commercial mortgage and other loans, Acquired	$ 0	$ 0	$ 0	$ 0
Commercial mortgage and other loans, Sold	13,000,000	0	96,000,000	0
Fixed maturities
Investment [Line Items]
Gross Unrealized Gains	78,615,000		78,615,000		$ 221,226,000
Gross unrealized losses	627,881,000		627,881,000		255,706,000
Gross unrealized losses of twelve months or more concentrated in various sectors	522,216,000		522,216,000		247,973,000
NAIC high or highest quality rating \| Fixed maturities
Investment [Line Items]
Gross unrealized losses	617,500,000		617,500,000		253,100,000
NAIC other than high or highest quality rating \| Fixed maturities
Investment [Line Items]
Gross unrealized losses	$ 10,400,000		$ 10,400,000		2,700,000
California
Investment [Line Items]
Commercial mortgage loans, Percentage	27.00%		27.00%
Texas
Investment [Line Items]
Commercial mortgage loans, Percentage	14.00%		14.00%
New York
Investment [Line Items]
Commercial mortgage loans, Percentage	7.00%		7.00%
Europe
Investment [Line Items]
Commercial mortgage loans, Percentage	11.00%		11.00%
Australia
Investment [Line Items]
Commercial mortgage loans, Percentage	3.00%		3.00%
Other Income \| Equity Securities
Investment [Line Items]
Unrealized Gain (Loss) on Investments	$ (300,000)	$ 800,000	$ 100,000	$ 1,700,000
Corporate securities
Investment [Line Items]
Gross unrealized losses of twelve months or more concentrated in various sectors	$ 522,200,000		$ 522,200,000		$ 248,000,000