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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance, Accumulated other comprehensive income |  |  | $ 738,794 |
Total other comprehensive income (loss) net of tax | $ (122,795) | $ 94,305 | (78,247) | $ 193,182
Ending balance, Accumulated other comprehensive income | (18,710) |  | (18,710) |
Accumulated Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance, Accumulated other comprehensive income |  |  | 77,400 | 1,300
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  | (77,600) | 60,500
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 0 | 0
Other Comprehensive Income (Loss), Tax |  |  | 0 | 0
Total other comprehensive income (loss) net of tax |  |  | (77,600) | 60,500
Ending balance, Accumulated other comprehensive income | (200) | 61,800 | (200) | 61,800
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance, Accumulated other comprehensive income |  |  | (22,300) | (18,600)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  | 500 | (2,500)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 800 | 0
Other Comprehensive Income (Loss), Tax |  |  | (100) | 500
Total other comprehensive income (loss) net of tax |  |  | 1,200 | (2,000)
Ending balance, Accumulated other comprehensive income | (21,100) | (20,600) | (21,100) | (20,600)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other (income) expense, net | (500) | 200 | (800) | 0
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance, Accumulated other comprehensive income |  |  | 4,500 | 435,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  | (2,100) | 213,200
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 200 | 0
Other Comprehensive Income (Loss), Tax |  |  | 0 | (78,500)
Total other comprehensive income (loss) net of tax |  |  | (1,900) | 134,700
Ending balance, Accumulated other comprehensive income | 2,600 | 569,700 | 2,600 | 569,700
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other (income) expense, net | 100 | 200 | 200 | 0
Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance, Accumulated other comprehensive income |  |  | 59,600 | 417,700
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  | (79,200) | 271,200
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 1,000 | 0
Other Comprehensive Income (Loss), Tax |  |  | (100) | (78,000)
Total other comprehensive income (loss) net of tax |  |  | (78,300) | 193,200
Ending balance, Accumulated other comprehensive income | $ (18,700) | $ 610,900 | $ (18,700) | $ 610,900

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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