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Derivatives (Narrative) (Details)	3 Months Ended	60 Months Ended
	Mar. 31, 2019 USD ($) item security	Dec. 31, 2005 security item	Dec. 31, 2018 USD ($)	Dec. 31, 2001 security
Derivative [Line Items]
Number of equity index put option contracts | security		7		7
Number of equity indices | item		2
Equity index put option liability	$ 8,727,000		$ 11,958,000
Equity Index Put Option Contracts [Member]
Derivative [Line Items]
Number of equity index put option contracts | item	1
Derivative expiration date	Jun. 09, 2017
Equity index put option liability	$ 0
Equity Index Put Option Contracts [Member] | Fair Value [Member]
Derivative [Line Items]
Equity index put option liability	$ 8,727,000		$ 11,958,000
Standard & Poor's 500 Index [Member]
Derivative [Line Items]
Number of equity index put option contracts | security	5
Theoretical maximum payout occurs based on index value	$ 0
Discount factor	3.00%
Present value of theoretical maximum payouts	$ 415,568,000
Settlement amount if contracts had expired	$ 0
Equity Index If Contracts Had Expired	2,834.40
Standard & Poor's 500 Index [Member] | Maximum [Member]
Derivative [Line Items]
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	1.00%
FTSE 100 Index [Member]
Derivative [Line Items]
Number of equity index put option contracts | security	1
Theoretical maximum payout occurs based on index value	$ 0
Discount factor	3.00%
Present value of theoretical maximum payouts	$ 42,035,000
Settlement amount if contracts had expired	$ 0
Equity Index If Contracts Had Expired | item	7,279.19
FTSE 100 Index [Member] | Maximum [Member]
Derivative [Line Items]
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	12.00%

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Estimates the Probability of Equity Index Put Option Contract Strike Price on the Exercise Date.

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Number of price risk derivative instruments held by the entity at the reporting date.

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