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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cost of sales | $ (78,052) | $ (100,047) | $ (159,125) | $ (196,617)
Income (Loss) Before Provision for Income Taxes | (11,259) | 17,869 | (26,004) | 26,214
Tax (expense) benefit | 3,589 | (5,468) | 7,520 | (7,162)
Total reclassifications for the period, net of tax | (7,670) | 12,401 | (18,484) | 19,052
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Defined benefit plan adjustments – actuarial losses | (7) | (124) | (97) | (204)
Income (Loss) Before Provision for Income Taxes | (258) | 1,113 | (421) | 1,502
Tax (expense) benefit | 67 | (504) | 103 | (663)
Total reclassifications for the period, net of tax | (191) | 609 | (318) | 839
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized investment gain | $ (251) | 1,393 | $ (324) | 1,965
Impairment Expense [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized investment gain |  | (2) |  | (105)
Net Losses on Derivatives Designated as Hedging Instruments [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cost of sales |  | $ (154) |  | $ (154)

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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