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Investments - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) security | Dec. 31, 2015 USD ($) security | Dec. 31, 2014 USD ($) | Sep. 30, 2016 security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of fixed maturity securities | security |  |  |  | 2
Impairment loss |  | $ 0 | $ 0 |
Number of fixed maturity and equity securities | security | 269 | 528 |  |
Percentage of gross unrealized loss | 100.00% | 100.00% |  |
Other Nonoperating Income (Expense) |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Recorded impairment | $ (2,500,000) |  |  |
Impairment loss | 163,000 | $ 0 |  |
Gain (Loss) on Investments |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Recorded impairment | $ (200,000) |  |  |
Fixed maturity securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Percentage of gross unrealized loss | 100.00% | 100.00% |  |
Fixed maturity securities | Investment grade |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Percentage of gross unrealized loss | 54.50% | 33.20% |  |
Percentage of fair value | 83.00% | 88.30% |  |
Not designated as hedging instrument | Mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investments at fair value | $ 15,200,000 | $ 21,000,000 |  |
Gain resulting for changes in fair value of securities | $ (1,200,000) | $ 300,000 |  |

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