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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income (loss) | $ 64,743 | $ 74,564 | $ (3,519)
Other comprehensive income (loss), before tax: |  |  |
Change in foreign currency translation adjustments | 37,454 | (10,278) | (25,841)
Unrealized gain (loss) on derivatives |  |  |
Unrealized derivative (loss) gain arising during period | (3,425) | 1,871 | (25)
Less: Reclassification adjustments for losses included in net loss | 2,958 | 0 | (923)
Unrealized (loss) gain on derivatives | (6,383) | 1,871 | 898
Defined benefit pension plan - net (loss) gain arising during period | (57) | (45) | 904
Total other comprehensive income (loss), before tax | 31,014 | (8,452) | (24,039)
Income tax expense (benefit) related to items in other comprehensive loss | 2,333 | (800) | (375)
Total other comprehensive income (loss), net of tax | 33,347 | (9,252) | (24,414)
Comprehensive income (loss), net of tax | $ 98,090 | $ 65,312 | $ (27,933)

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