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Guarantor Subsidiaries Financial Information - Condensed Income Statement (Q3) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,077,814 |  | $ 957,931 |  |  |  |  |  |  | $ 3,245,671 | $ 2,806,218 |  |  |
Cost of sales | (775,802) |  | (704,728) |  |  |  |  |  |  | (2,308,811) | (2,009,345) | $ (2,816,443) | $ (2,006,949) | $ (2,260,182)
Gross profit | 302,012 | $ 268,440 | 253,203 | $ 273,963 | $ 269,707 | $ 219,189 | $ 212,481 | $ 237,389 | $ 255,180 | 936,860 | 796,873 | 1,065,313 | 924,239 | 1,047,816
Total operating expenses | (176,833) |  | (151,537) |  |  |  |  |  |  | (556,879) | (467,338) | (644,234) | (467,632) | (438,962)
Income from operations | 125,179 | 91,545 | 101,666 | 113,356 | 114,512 | 62,623 | 119,400 | 132,375 | 142,209 | 379,981 | 329,535 | 421,079 | 456,607 | 608,854
Interest (expense) income, net | (23,713) |  | (20,038) |  |  |  |  |  |  | (75,917) | (57,460) | (77,884) | (50,298) | (27,254)
Other income (expense), net | 1,201 |  | (443) |  |  |  |  |  |  | 5,958 | 5,304 | 8,868 | 6,528 | 3,768
Equity earnings (loss) | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Income from operations before income taxes | 102,667 |  | 81,185 |  |  |  |  |  |  | 310,022 | 277,379 | 352,063 | 412,837 | 585,368
Income tax expense | (16,598) |  | (12,746) |  |  |  |  |  |  | (53,225) | (64,776) | (89,773) | (99,433) | (186,740)
Net income | 86,069 |  | 68,439 |  |  |  |  |  |  | 256,797 | 212,603 | 262,290 | 313,404 | 398,628
Less: Net loss (gain) attributable to noncontrolling interest | 1,670 |  | (1,040) |  |  |  |  |  |  | 3,724 | 710 | (29) | (8,517) | 0
Net income attributable to Wabtec shareholders | 87,739 | $ 48,948 | 67,399 | $ 72,025 | $ 73,889 | $ 46,328 | $ 82,428 | $ 90,485 | $ 94,163 | 260,521 | 213,313 | 262,261 | 304,887 | 398,628
Comprehensive income attributable to Wabtec shareholders | 38,207 |  | 160,019 |  |  |  |  |  |  | 99,780 | 500,988 | 596,874 | 202,001 | 281,395
Elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | (60,397) |  | (28,421) |  |  |  |  |  |  | (178,943) | (85,791) |  |  |
Cost of sales | 34,238 |  | 15,557 |  |  |  |  |  |  | 105,071 | 59,386 | 98,720 | 98,125 | 82,801
Gross profit | (26,159) |  | (12,864) |  |  |  |  |  |  | (73,872) | (26,405) | (30,605) | (43,825) | (62,213)
Total operating expenses | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Income from operations | (26,159) |  | (12,864) |  |  |  |  |  |  | (73,872) | (26,405) | (30,605) | (43,825) | (62,213)
Interest (expense) income, net | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Other income (expense), net | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Equity earnings (loss) | (188,886) |  | (145,694) |  |  |  |  |  |  | (635,205) | (428,169) | (733,682) | (614,834) | (723,306)
Income from operations before income taxes | (215,045) |  | (158,558) |  |  |  |  |  |  | (709,077) | (454,574) | (764,287) | (658,659) | (785,519)
Income tax expense | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Net income | (215,045) |  | (158,558) |  |  |  |  |  |  | (709,077) | (454,574) | (764,287) | (658,659) | (785,519)
Less: Net loss (gain) attributable to noncontrolling interest | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Net income attributable to Wabtec shareholders | (215,045) |  | (158,558) |  |  |  |  |  |  | (709,077) | (454,574) | (764,287) | (658,659) | (785,519)
Comprehensive income attributable to Wabtec shareholders | (215,045) |  | (158,558) |  |  |  |  |  |  | (709,077) | (454,574) | (764,287) | (658,659) | (785,519)
Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 169,445 |  | 134,905 |  |  |  |  |  |  | 499,172 | 417,156 |  |  |
Cost of sales | (122,946) |  | (111,774) |  |  |  |  |  |  | (364,523) | (311,037) | (440,911) | (473,700) | (531,269)
Gross profit | 46,499 |  | 23,131 |  |  |  |  |  |  | 134,649 | 106,119 | 136,486 | 168,109 | 211,993
Total operating expenses | (37,090) |  | (22,886) |  |  |  |  |  |  | (122,497) | (80,478) | (114,199) | (142,817) | (142,310)
Income from operations | 9,409 |  | 245 |  |  |  |  |  |  | 12,152 | 25,641 | 22,287 | 25,292 | 69,683
Interest (expense) income, net | (23,012) |  | (20,295) |  |  |  |  |  |  | (75,140) | (55,783) | (76,823) | (38,843) | (28,312)
Other income (expense), net | (1,479) |  | 1,520 |  |  |  |  |  |  | 7,733 | 6,863 | 10,020 | 25,254 | 27,733
Equity earnings (loss) | 97,128 |  | 80,874 |  |  |  |  |  |  | 330,978 | 246,103 | 416,068 | 322,650 | 506,903
Income from operations before income taxes | 82,046 |  | 62,344 |  |  |  |  |  |  | 275,723 | 222,824 | 371,552 | 334,353 | 576,007
Income tax expense | 5,693 |  | 5,056 |  |  |  |  |  |  | (15,202) | (9,511) | (109,294) | (29,466) | (177,379)
Net income | 87,739 |  | 67,400 |  |  |  |  |  |  | 260,521 | 213,313 | 262,258 | 304,887 | 398,628
Less: Net loss (gain) attributable to noncontrolling interest | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Net income attributable to Wabtec shareholders | 87,739 |  | 67,400 |  |  |  |  |  |  | 260,521 | 213,313 | 262,258 | 304,887 | 398,628
Comprehensive income attributable to Wabtec shareholders | 87,867 |  | 66,815 |  |  |  |  |  |  | 261,156 | 214,483 | 263,907 | 305,180 | 409,734
Guarantors |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 118,516 |  | 89,881 |  |  |  |  |  |  | 374,599 | 288,312 |  |  |
Cost of sales | (75,021) |  | (53,692) |  |  |  |  |  |  | (236,699) | (177,593) | (255,792) | (280,973) | (311,911)
Gross profit | 43,495 |  | 36,189 |  |  |  |  |  |  | 137,900 | 110,719 | 142,428 | 154,891 | 367,555
Total operating expenses | (14,746) |  | (12,714) |  |  |  |  |  |  | (40,687) | (37,783) | (50,902) | (50,361) | (36,358)
Income from operations | 28,749 |  | 23,475 |  |  |  |  |  |  | 97,213 | 72,936 | 91,526 | 104,530 | 331,197
Interest (expense) income, net | 3,212 |  | 2,811 |  |  |  |  |  |  | 9,291 | 8,041 | 10,916 | 9,294 | 8,406
Other income (expense), net | 1 |  | 0 |  |  |  |  |  |  | (678) | (229) | 274 | (1,689) | (3,711)
Equity earnings (loss) | 91,758 |  | 64,820 |  |  |  |  |  |  | 304,227 | 182,066 | 317,614 | 292,184 | 216,403
Income from operations before income taxes | 123,720 |  | 91,106 |  |  |  |  |  |  | 410,053 | 262,814 | 420,330 | 404,319 | 552,295
Income tax expense | (2) |  | 0 |  |  |  |  |  |  | (2) | 0 | 18,762 | (52,308) | 8,760
Net income | 123,718 |  | 91,106 |  |  |  |  |  |  | 410,051 | 262,814 | 439,092 | 352,011 | 561,055
Less: Net loss (gain) attributable to noncontrolling interest | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Net income attributable to Wabtec shareholders | 123,718 |  | 91,106 |  |  |  |  |  |  | 410,051 | 262,814 | 439,092 | 352,011 | 561,055
Comprehensive income attributable to Wabtec shareholders | 123,718 |  | 91,106 |  |  |  |  |  |  | 410,051 | 262,814 | 439,092 | 352,011 | 561,055
Non-Guarantors |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 850,250 |  | 761,566 |  |  |  |  |  |  | 2,550,843 | 2,186,541 |  |  |
Cost of sales | (612,073) |  | (554,819) |  |  |  |  |  |  | (1,812,660) | (1,580,101) | (2,218,460) | (1,350,401) | (1,499,803)
Gross profit | 238,177 |  | 206,747 |  |  |  |  |  |  | 738,183 | 606,440 | 817,004 | 645,064 | 530,481
Total operating expenses | (124,997) |  | (115,937) |  |  |  |  |  |  | (393,695) | (349,077) | (479,133) | (274,454) | (260,294)
Income from operations | 113,180 |  | 90,810 |  |  |  |  |  |  | 344,488 | 257,363 | 337,871 | 370,610 | 270,187
Interest (expense) income, net | (3,913) |  | (2,554) |  |  |  |  |  |  | (10,068) | (9,718) | (11,977) | (20,749) | (7,348)
Other income (expense), net | 2,679 |  | (1,963) |  |  |  |  |  |  | (1,097) | (1,330) | (1,426) | (17,037) | (20,254)
Equity earnings (loss) | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Income from operations before income taxes | 111,946 |  | 86,293 |  |  |  |  |  |  | 333,323 | 246,315 | 324,468 | 332,824 | 242,585
Income tax expense | (22,289) |  | (17,802) |  |  |  |  |  |  | (38,021) | (55,265) | 759 | (17,659) | (18,121)
Net income | 89,657 |  | 68,491 |  |  |  |  |  |  | 295,302 | 191,050 | 325,227 | 315,165 | 224,464
Less: Net loss (gain) attributable to noncontrolling interest | 1,670 |  | (1,040) |  |  |  |  |  |  | 3,724 | 710 | (29) | (8,517) | 0
Net income attributable to Wabtec shareholders | 91,327 |  | 67,451 |  |  |  |  |  |  | 299,026 | 191,760 | 325,198 | 306,648 | 224,464
Comprehensive income attributable to Wabtec shareholders | $ 41,667 |  | $ 160,656 |  |  |  |  |  |  | $ 137,650 | $ 478,265 | $ 658,162 | $ 203,469 | $ 96,125

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