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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Mar. 31, 2017
Unrealized gains (losses) on available-for-sale securities, tax |  | $ 0 | $ 0 |
Change in loss on derivative contract, tax |  | 0 | 0 |
Change in supplemental executive retirement plan pension liability, tax |  | 0 | 0 |
Change in Pension Plan minimum liability, tax |  | 0 | 0 |
Change in Other Benefit Plan minimum liability, tax |  | $ 0 | $ 0 |
Predecessor |  |  |  |
Unrealized gains (losses) on available-for-sale securities, tax | $ 0 |  |  | $ 61
Change in loss on derivative contract, tax | 0 |  |  | 823
Change in supplemental executive retirement plan pension liability, tax | 0 |  |  | (927)
Change in Pension Plan minimum liability, tax | 0 |  |  | 215
Change in Other Benefit Plan minimum liability, tax | $ 0 |  |  | $ (2,046)

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- Definition Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 + Details
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