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Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (11,341) |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ 0
Other comprehensive income (loss) before reclassification adjustment | 7,134 | $ (3,145) |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 105 | (103) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | 0 |  |
Total other comprehensive (loss) income | 7,239 | (5,492) |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (4,102) |  |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (11,697) | (7,510) |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | (1,344)
Other comprehensive income (loss) before reclassification adjustment | 7,134 | (3,145) |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | (2,244) |  |
Total other comprehensive (loss) income | 7,134 | (5,389) |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (4,563) | (12,899) |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 461 | 299 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | 0
Other comprehensive income (loss) before reclassification adjustment | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 |  |
Total other comprehensive (loss) income | 0 | 0 |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 461 | 299 |  |
Derivative [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (105) | (306) |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | 0
Total other comprehensive (loss) income | 105 | (103) |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 0 | (409) |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (11,341) | (7,517) |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ (1,344)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 7,239 | (3,248) |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | (2,244) |  |
Total other comprehensive (loss) income | 7,239 | (5,492) |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (4,102) | (13,009) |  |
Previously Reported [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (11,697) | (6,166) |  |
Previously Reported [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 461 | 299 |  |
Previously Reported [Member] | Derivative [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (105) | (306) |  |
Previously Reported [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (11,341) | $ (6,173) |  |
Effect of ASU Adoption [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 0 |
Effect of ASU Adoption [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | 0 |
Effect of ASU Adoption [Member] | Derivative [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | 0 |
Effect of ASU Adoption [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 0 |

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