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Segment Reporting (Schedule of Information Relating to Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales to external customers | $ 547,137 | $ 554,814 | $ 547,483 | $ 498,336 | $ 402,899 | $ 412,370 | $ 440,831 | $ 422,798 | $ 2,147,770 | $ 1,678,898 | $ 1,403,066
Operating profit (loss) |  |  |  |  |  |  |  |  | 214,281 | 200,850 | 116,254
Total assets | 945,858 |  |  |  | 786,904 |  |  |  | 945,858 | 786,904 | 622,856
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 153,445 | 86,602 | 67,587
Depreciation and amortization |  |  |  |  |  |  |  |  | 54,727 | 46,167 | 41,624
Purchase of long-lived assets as part of business acquisition |  |  |  |  |  |  |  |  | 65,000 | 42,000 | 38,600
OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales to external customers |  |  |  |  |  |  |  |  | 1,976,623 | 1,548,091 | 1,300,060
Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales to external customers |  |  |  |  |  |  |  |  | 171,147 | 130,807 | 103,006
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  | 0 | 0 | (3,716)
Total assets | 83,623 |  |  |  | 152,308 |  |  |  | 83,623 | 152,308 | 65,439
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 314 | $ 276 | $ 143
Net sales | OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 92.00% | 92.00% | 93.00%
Net sales | Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 8.00% | 8.00% | 7.00%
Customer Concentration Risk | Net sales | Thor Industries, Inc. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 38.00% | 37.00% | 28.00%
Customer Concentration Risk | Net sales | Berkshire Hathaway Inc. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 25.00% | 26.00% | 26.00%
Customer Concentration Risk | Net sales | Jayco, Inc. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  |  | 10.00% |
International | Geographic Concentration Risk | Net sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Consolidated risk, percentage |  |  |  |  |  |  |  |  | 4.00% | 2.00% | 1.00%
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales to external customers |  |  |  |  |  |  |  |  | $ 2,147,770 | $ 1,678,898 | $ 1,403,066
Operating profit (loss) |  |  |  |  |  |  |  |  | 214,281 | 200,850 | 119,970
Total assets | 862,235 |  |  |  | 634,596 |  |  |  | 862,235 | 634,596 | 557,417
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 153,445 | 86,602 | 67,587
Depreciation and amortization |  |  |  |  |  |  |  |  | 54,413 | 45,891 | 41,481
Operating Segments | OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales to external customers |  |  |  |  |  |  |  |  | 1,976,623 | 1,548,091 | 1,300,060
Operating profit (loss) |  |  |  |  |  |  |  |  | 190,276 | 180,850 | 105,224
Total assets | 785,926 |  |  |  | 569,385 |  |  |  | 785,926 | 569,385 | 500,734
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 148,570 | 80,588 | 65,492
Depreciation and amortization |  |  |  |  |  |  |  |  | 50,751 | 42,593 | 38,583
Operating Segments | Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales to external customers |  |  |  |  |  |  |  |  | 171,147 | 130,807 | 103,006
Operating profit (loss) |  |  |  |  |  |  |  |  | 24,005 | 20,000 | 14,746
Total assets | $ 76,309 |  |  |  | $ 65,211 |  |  |  | 76,309 | 65,211 | 56,683
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 4,875 | 6,014 | 2,095
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 3,662 | $ 3,298 | $ 2,898

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