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Investments (Other Than Temporary Impairment by Asset Type) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) Securities | Dec. 31, 2015 USD ($) Securities | Dec. 31, 2014 USD ($) Securities
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 22 | 14 |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (21,349) | $ (25,547) | $ 0
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | (1,330) | 6,011 | (2,627)
Net OTTI losses recognized in operations | $ (9,560) | $ (2,979) | $ (4,446) | $ (5,694) | $ (13,347) | $ (5,229) | $ (828) | $ (132) | $ (22,679) | $ (19,536) | $ (2,627)
Corporate Securities [Member] | Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 2 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (642) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (642) |  |
Corporate Securities [Member] | Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 1 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (4,554) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 1,575 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (2,979) |  |
Corporate Securities [Member] | Telecommunications [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 1 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (4,462) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 562 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (3,900) |  |
Corporate Securities [Member] | Utilities [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 2 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (6,961) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 798 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (6,163) |  |
Corporate Securities [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  |  | 2 |
Total OTTI losses |  |  |  |  |  |  |  |  |  | $ (15,414) |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  |  | 2,975 |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  |  | $ (12,439) |
Residential Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 9 | 11 | 7
Total OTTI losses |  |  |  |  |  |  |  |  | $ 0 | $ (133) | $ 0
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | (783) | (2,089) | (2,627)
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (783) | $ (2,222) | $ (2,627)
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 5 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (1,540) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (1,540) |  |
Other Asset Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 2 | 1 |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (3,190) | $ (10,000) |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | (3,482) | 5,125 |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (6,672) | $ (4,875) |

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