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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 1,117,876	$ 1,077,814	$ 1,111,680	$ 1,056,177	$ 1,075,538	$ 957,931	$ 932,253	$ 916,034	$ 4,363,547	$ 3,881,756	$ 2,931,188
Cost of sales									(3,129,662)	(2,816,443)	(2,006,949)
Gross profit	297,025	302,012	323,967	310,881	268,440	253,203	273,963	269,707	1,233,885	1,065,313	924,239
Selling, general and administrative expenses									(633,244)	(512,552)	(373,559)
Engineering expenses									(87,450)	(95,166)	(71,375)
Amortization expense									(39,754)	(36,516)	(22,698)
Total operating expenses									(760,448)	(644,234)	(467,632)
Income from operations	93,456	125,179	123,523	131,279	91,545	101,666	113,356	114,512	473,437	421,079	456,607
Other income and expenses
Interest expense, net									(112,235)	(77,884)	(50,298)
Other income, net									6,380	8,868	6,528
Income from operations before income taxes									367,582	352,063	412,837
Income tax expense									(75,879)	(89,773)	(99,433)
Net income									291,703	262,290	313,404
Less: Net loss (income) attributable to noncontrolling interest									3,241	(29)	(8,517)
Net income attributable to Wabtec shareholders	$ 34,423	$ 87,739	$ 84,416	$ 88,366	$ 48,948	$ 67,399	$ 72,025	$ 73,889	$ 294,944	$ 262,261	$ 304,887
Basic
Net income attributable to Wabtec shareholders (in dollars per share)	$ 0.36	$ 0.91	$ 0.88	$ 0.92	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 3.06	$ 2.74	$ 3.37
Diluted
Net income attributable to Wabtec shareholders (in dollars per share)	$ 0.36	$ 0.91	$ 0.87	$ 0.92	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 3.05	$ 2.72	$ 3.34
Weighted average shares outstanding
Basic (in shares)									95,994	95,453	90,359
Diluted (in shares)									96,464	96,125	91,141

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