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Segment Reporting (Schedule of Information Relating to Segments) (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
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 536,616 | $ 604,244 | $ 684,455 | $ 650,492 | $ 547,137 | $ 554,814 | $ 547,483 | $ 498,336 | $ 2,475,807 | $ 2,147,770 | $ 1,678,898
Operating profit (loss) |  |  |  |  |  |  |  |  | 198,788 | 214,281 | 200,850
Total assets | 1,243,893 |  |  |  | 945,858 |  |  |  | 1,243,893 | 945,858 | 786,904
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 268,439 | 153,445 | 86,602
Depreciation and amortization |  |  |  |  |  |  |  |  | 67,526 | 54,727 | 46,167
Purchase of long-lived assets as part of business acquisition |  |  |  |  |  |  |  |  | 150,900 | 65,000 | 42,000
OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,242,616 | 1,976,623 | 1,548,091
Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 233,191 | 171,147 | 130,807
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 79,863 |  |  |  | 83,623 |  |  |  | 79,863 | 83,623 | 152,308
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 0 | $ 314 | $ 276
Net sales | OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 91.00% | 92.00% | 92.00%
Net sales | Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 9.00% | 8.00% | 8.00%
Customer Concentration Risk | Net sales | Thor Industries, Inc. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 31.00% | 38.00% | 37.00%
Customer Concentration Risk | Net sales | Berkshire Hathaway Inc. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 23.00% | 25.00% | 26.00%
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 2,475,807 | $ 2,147,770 | $ 1,678,898
Operating profit (loss) |  |  |  |  |  |  |  |  | 198,788 | 214,281 | 200,850
Total assets | 1,164,030 |  |  |  | 862,235 |  |  |  | 1,164,030 | 862,235 | 634,596
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 268,439 | 153,445 | 86,602
Depreciation and amortization |  |  |  |  |  |  |  |  | 67,526 | 54,413 | 45,891
Operating Segments | OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,242,616 | 1,976,623 | 1,548,091
Operating profit (loss) |  |  |  |  |  |  |  |  | 167,459 | 190,276 | 180,850
Total assets | 1,034,254 |  |  |  | 785,926 |  |  |  | 1,034,254 | 785,926 | 569,385
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 247,895 | 148,570 | 80,588
Depreciation and amortization |  |  |  |  |  |  |  |  | 63,447 | 50,751 | 42,593
Operating Segments | Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 233,191 | 171,147 | 130,807
Operating profit (loss) |  |  |  |  |  |  |  |  | 31,329 | 24,005 | 20,000
Total assets | $ 129,776 |  |  |  | $ 76,309 |  |  |  | 129,776 | 76,309 | 65,211
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 20,544 | 4,875 | 6,014
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 4,079 | $ 3,662 | $ 3,298

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