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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income attributable to Wabtec shareholders | $ 262,261 | $ 304,887 | $ 398,628
Foreign currency translation gain (loss) | 326,096 | (93,684) | (132,899)
Unrealized gain (loss) on derivative contracts | 9,799 | 305 | (1,202)
Unrealized gain (loss) on pension benefit plans and post-retirement benefit plans | 2,845 | (12,021) | 26,689
Other comprehensive gain (loss) before tax | 338,740 | (105,400) | (107,412)
Income tax (expense) benefit related to components of other comprehensive (loss) income | (4,127) | 2,514 | (9,821)
Other comprehensive income (loss), net of tax | 334,613 | (102,886) | (117,233)
Comprehensive income attributable to Wabtec shareholders | $ 596,874 | $ 202,001 | $ 281,395

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