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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Nabors | $ (116,344) | $ (148,532) | $ (132,951) | $ (148,984) | $ (335,587) | $ (111,211) | $ (184,650) | $ (398,294) | $ (546,811) | $ (1,029,742) | $ (372,675)
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |  |  |  |
Translation adjustment attributable to Nabors |  |  |  |  |  |  |  |  | 28,372 | 17,743 | (110,874)
Unrealized gains (losses) on marketable securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on marketable securities |  |  |  |  |  |  |  |  | (6,061) | 11,054 | (15,310)
Less: reclassification adjustment for (gains) losses included in net income (loss) |  |  |  |  |  |  |  |  | 970 | 3,495 |
Unrealized gains (losses) on marketable securities |  |  |  |  |  |  |  |  | (5,091) | 14,549 | (15,310)
Pension liability amortization and adjustment |  |  |  |  |  |  |  |  | (275) | 1,061 | 1,104
Pension buyout |  |  |  |  |  |  |  |  |  | 3,059 |
Unrealized gains (losses) and amortization on cash flow hedges |  |  |  |  |  |  |  |  | 613 | 613 | 613
Other comprehensive income (loss), before tax |  |  |  |  |  |  |  |  | 23,619 | 37,025 | (124,467)
Income tax expense (benefit) related to items of other comprehensive income (loss) |  |  |  |  |  |  |  |  | 315 | 1,551 | 648
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 23,304 | 35,474 | (125,115)
Comprehensive income (loss) attributable to Nabors |  |  |  |  |  |  |  |  | (523,507) | (994,268) | (497,790)
Net income (loss) attributable to noncontrolling interest | $ 1,177 | $ 2,113 | $ 1,971 | $ 917 | $ 1,125 | $ 1,185 | $ (2,899) | $ 724 | 6,178 | 135 | 381
Translation adjustment attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 282 | 251 | (1,461)
Comprehensive income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 6,460 | 386 | (1,080)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ (517,047) | $ (993,882) | $ (498,870)

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