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Derivatives (Narrative) (Details) | 6 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) GBP (£) Item | Dec. 31, 2005 Item | Dec. 31, 2018 USD ($) | Dec. 31, 2001 Item
Derivative [Line Items] |  |  |  |
Number of equity index put option contracts | Item |  | 7 |  | 7
Number of equity indices | Item |  | 2 |  |
Equity index put option liability | $ 8,374,000 |  | $ 11,958,000 |
Equity Index Put Option Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
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 | $ 8,374,000 |  | $ 11,958,000 |
Equity Index Put Option Contract, Expired On July 1, 2019 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Number of equity index put option contracts | Item | 1 |  |  |
Present value of theoretical maximum payouts | $ 80,993,000 |  |  |
Equity Index Put Option Contract, Expired Prior To June 30, 2019 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Number of equity index put option contracts | Item | 2 |  |  |
Standard & Poor's 500 Index [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Number of equity index put option contracts | Item | 4 |  |  |
Theoretical maximum payout occurs based on index value | $ 0 |  |  |
Discount factor | 3.00% |  |  |
Present value of theoretical maximum payouts | $ 353,283,000 |  |  |
Settlement amount if contracts had expired | $ 0 |  |  |
Equity Index If Contracts Had Expired | 2,941.76 |  |  |
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 | Item | 1 |  |  |
Theoretical maximum payout occurs based on index value | $ 0 |  |  |
Discount factor | 3.00% |  |  |
Present value of theoretical maximum payouts | $ 40,113,000 |  |  |
Settlement amount if contracts had expired | $ 0 |  |  |
Equity Index If Contracts Had Expired | £ | 7,425.63 |  |  |
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 | 9.00% |  |  |

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