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Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | $ 0 | $ 0 | $ (224)
Amounts reclassified from accumulated other comprehensive income (loss) | 8 | 7 | 34
Other Comprehensive Loss | (35) | 1,138 | (806)
Reclassification due to the adoption of ASU No. 2018-02 | (1,645) |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (382) | 629 | 2,539
Other comprehensive income (loss) before reclassifications | (940) | (1,024) | (1,832)
Amounts reclassified from accumulated other comprehensive income (loss) | 337 | 13 | (78)
Other Comprehensive Loss | (603) | (1,011) | (1,910)
Reclassification due to the adoption of ASU No. 2018-02 | (265) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (1,250) | (382) | 629
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (5,737) | (7,893) | (9,255)
Other comprehensive income (loss) before reclassifications | 214 | 1,721 | 848
Amounts reclassified from accumulated other comprehensive income (loss) | 362 | 435 | 514
Other Comprehensive Loss | 576 | 2,156 | 1,362
Reclassification due to the adoption of ASU No. 2018-02 | (1,219) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6,380) | (5,737) | (7,893)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (715) | (708) | (450)
Other comprehensive income (loss) before reclassifications | 0 | 0 | (224)
Amounts reclassified from accumulated other comprehensive income (loss) | (8) | (7) | (34)
Other Comprehensive Loss | (8) | (7) | (258)
Reclassification due to the adoption of ASU No. 2018-02 | (161) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (884) | (715) | (708)
AOCI Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6,834) | (7,972) | (7,166)
Other comprehensive income (loss) before reclassifications | (726) | 697 | (1,208)
Amounts reclassified from accumulated other comprehensive income (loss) | 691 | 441 | 402
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ (8,514) | $ (6,834) | $ (7,972)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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