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GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Income Statement (Details) - USD ($) $ 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
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
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
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
Interest expense, net |  |  |  |  |  |  |  |  | (112,235) | (77,884) | (50,298)
Other income, net |  |  |  |  |  |  |  |  | 6,380 | 8,868 | 6,528
Equity earnings (loss) |  |  |  |  |  |  |  |  | 0 | 0 | 0
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
Comprehensive income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 83,353 | 596,874 | 202,001
Elimination |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (232,775) | (129,325) | (141,950)
Cost of sales |  |  |  |  |  |  |  |  | 132,250 | 98,720 | 98,125
Gross profit |  |  |  |  |  |  |  |  | (100,525) | (30,605) | (43,825)
Total operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from operations |  |  |  |  |  |  |  |  | (100,525) | (30,605) | (43,825)
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity earnings (loss) |  |  |  |  |  |  |  |  | (766,320) | (733,682) | (614,834)
Income from operations before income taxes |  |  |  |  |  |  |  |  | (866,845) | (764,287) | (658,659)
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | (866,845) | (764,287) | (658,659)
Less: Net loss (income) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | (866,845) | (764,287) | (658,659)
Comprehensive income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | (866,845) | (764,287) | (658,659)
Parent | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 671,035 | 577,397 | 641,809
Cost of sales |  |  |  |  |  |  |  |  | (495,090) | (440,911) | (473,700)
Gross profit |  |  |  |  |  |  |  |  | 175,945 | 136,486 | 168,109
Total operating expenses |  |  |  |  |  |  |  |  | (172,978) | (114,199) | (142,817)
Income from operations |  |  |  |  |  |  |  |  | 2,967 | 22,287 | 25,292
Interest expense, net |  |  |  |  |  |  |  |  | (110,801) | (76,823) | (38,843)
Other income, net |  |  |  |  |  |  |  |  | 13,452 | 10,020 | 25,254
Equity earnings (loss) |  |  |  |  |  |  |  |  | 396,944 | 416,068 | 322,650
Income from operations before income taxes |  |  |  |  |  |  |  |  | 302,562 | 371,552 | 334,353
Income tax expense |  |  |  |  |  |  |  |  | (7,618) | (109,294) | (29,466)
Net income |  |  |  |  |  |  |  |  | 294,944 | 262,258 | 304,887
Less: Net loss (income) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 294,944 | 262,258 | 304,887
Comprehensive income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 295,774 | 263,907 | 305,180
Guarantors | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 483,058 | 398,220 | 435,864
Cost of sales |  |  |  |  |  |  |  |  | (304,286) | (255,792) | (280,973)
Gross profit |  |  |  |  |  |  |  |  | 178,772 | 142,428 | 154,891
Total operating expenses |  |  |  |  |  |  |  |  | (57,274) | (50,902) | (50,361)
Income from operations |  |  |  |  |  |  |  |  | 121,498 | 91,526 | 104,530
Interest expense, net |  |  |  |  |  |  |  |  | 12,794 | 10,916 | 9,294
Other income, net |  |  |  |  |  |  |  |  | 20 | 274 | (1,689)
Equity earnings (loss) |  |  |  |  |  |  |  |  | 369,376 | 317,614 | 292,184
Income from operations before income taxes |  |  |  |  |  |  |  |  | 503,688 | 420,330 | 404,319
Income tax expense |  |  |  |  |  |  |  |  | (3,299) | 18,762 | (52,308)
Net income |  |  |  |  |  |  |  |  | 500,389 | 439,092 | 352,011
Less: Net loss (income) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 500,389 | 439,092 | 352,011
Comprehensive income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 500,389 | 439,092 | 352,011
Non-Guarantors | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,442,229 | 3,035,464 | 1,995,465
Cost of sales |  |  |  |  |  |  |  |  | (2,462,536) | (2,218,460) | (1,350,401)
Gross profit |  |  |  |  |  |  |  |  | 979,693 | 817,004 | 645,064
Total operating expenses |  |  |  |  |  |  |  |  | (530,196) | (479,133) | (274,454)
Income from operations |  |  |  |  |  |  |  |  | 449,497 | 337,871 | 370,610
Interest expense, net |  |  |  |  |  |  |  |  | (14,228) | (11,977) | (20,749)
Other income, net |  |  |  |  |  |  |  |  | (7,092) | (1,426) | (17,037)
Equity earnings (loss) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from operations before income taxes |  |  |  |  |  |  |  |  | 428,177 | 324,468 | 332,824
Income tax expense |  |  |  |  |  |  |  |  | (64,962) | 759 | (17,659)
Net income |  |  |  |  |  |  |  |  | 363,215 | 325,227 | 315,165
Less: Net loss (income) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 3,241 | (29) | (8,517)
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 366,456 | 325,198 | 306,648
Comprehensive income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | $ 154,035 | $ 658,162 | $ 203,469

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