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Investments (Other Than Temporary Impairment by Asset Type) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Securities | Dec. 31, 2017 USD ($) Securities | Dec. 31, 2016 USD ($) Securities
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 35 | 10 | 22
Total OTTI losses |  |  |  |  |  |  |  |  | $ (35,005) | $ (2,758) | $ (21,349)
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | (1,651) | (1,872) | (1,330)
Net OTTI losses recognized in operations | $ (18,980) | $ (14,373) | $ (2,396) | $ (907) | $ (3,076) | $ (464) | $ (949) | $ (141) | $ (36,656) | $ (4,630) | $ (22,679)
Corporate Securities | Capital Goods |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 1 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (719) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (719) |  |
Corporate Securities | Consumer Discretionary |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 8 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (9,533) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (9,533) |  |
Corporate Securities | Energy |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 4 |  | 2
Total OTTI losses |  |  |  |  |  |  |  |  | $ (4,793) |  | $ (642)
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  | 0
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (4,793) |  | $ (642)
Corporate Securities | Financials |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 5 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (3,495) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (3,495) |  |
Corporate Securities | Information Technology |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 1 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (550) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (550) |  |
Corporate Securities | Industrials |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 1 | 1 |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (2,299) | $ (2,485) |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 | 0 |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (2,299) | $ (2,485) |
Corporate Securities | Materials |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [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 | Telecommunications |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 2 |  | 1
Total OTTI losses |  |  |  |  |  |  |  |  | $ (249) |  | $ (4,462)
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  | 562
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (249) |  | $ (3,900)
Corporate Securities | Transportation |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 1 |  |
Total OTTI losses |  |  |  |  |  |  |  |  | $ (178) |  |
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  |
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (178) |  |
Corporate Securities | Utilities |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 2 |  | 2
Total OTTI losses |  |  |  |  |  |  |  |  | $ (5,518) |  | $ (6,961)
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  | 798
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (5,518) |  | $ (6,163)
Residential Mortgage Backed Securities |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 3 | 8 | 9
Total OTTI losses |  |  |  |  |  |  |  |  | $ (63) | $ (273) | $ 0
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | (295) | (1,585) | (783)
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (358) | $ (1,858) | $ (783)
Commercial Mortgage Backed Securities |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 5 |  | 5
Total OTTI losses |  |  |  |  |  |  |  |  | $ (4,859) |  | $ (1,540)
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | 0 |  | 0
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (4,859) |  | $ (1,540)
Other Asset Backed Securities |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment, number of securities | Securities |  |  |  |  |  |  |  |  | 2 | 1 | 2
Total OTTI losses |  |  |  |  |  |  |  |  | $ (2,749) | $ 0 | $ (3,190)
Portion of OTTI losses recognized in (from) other comprehensive income |  |  |  |  |  |  |  |  | (1,356) | (287) | (3,482)
Net OTTI losses recognized in operations |  |  |  |  |  |  |  |  | $ (4,105) | $ (287) | $ (6,672)

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