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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Balance Sheet [Abstract] |  |  |  |  |  |  |  |
Unreturned customer inventories |  | $ 21,295 | [1] |  | $ 21,295 | [1] |  | $ 0
Prepaid expenses and other current assets |  | 11,681 |  |  | 11,681 |  |  | 12,300
Accrued customer returns |  | 53,717 |  |  | 53,717 |  |  | 35,916
Accrued core liability |  | 30,002 |  |  | 30,002 |  |  | 11,899
Retained earnings |  | 381,503 |  |  | 381,503 |  |  | 357,153
Statement of Operations [Abstract] |  |  |  |  |  |  |  |
Net sales | [2] | 296,619 |  | $ 281,058 | 845,081 |  | $ 876,165 |
Cost of sales |  | 209,313 |  | 198,523 | 603,897 |  | 618,854 |
Earnings from continuing operations before taxes |  | 26,275 |  | 26,643 | 60,498 |  | 82,204 |
Provision for income taxes |  | 7,002 |  | 9,535 | 15,801 |  | 30,468 |
Net earnings |  | 15,749 |  | $ 13,125 | 39,683 |  | $ 46,623 |
ASC 606 [Member] |  |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |
Unreturned customer inventories |  |  |  |  |  |  |  | 19,950
Accrued customer returns |  |  |  |  |  |  |  | 42,586
Accrued core liability |  |  |  |  |  |  |  | 26,368
Retained earnings |  |  |  |  |  |  |  | 355,964
Adjustments Due to Adoption of ASU 2014-09 [Member] | ASC 606 [Member] |  |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |
Unreturned customer inventories |  | 21,295 |  |  | 21,295 |  |  | 19,950
Prepaid expenses and other current assets |  | (226) |  |  | (226) |  |  |
Accrued customer returns |  | 7,783 |  |  | 7,783 |  |  | 6,670
Accrued core liability |  | 13,837 |  |  | 13,837 |  |  | 14,469
Retained earnings |  | (551) |  |  | (551) |  |  | $ (1,189)
Statement of Operations [Abstract] |  |  |  |  |  |  |  |
Net sales |  | (1,821) |  |  | 632 |  |  |
Cost of sales |  | (1,617) |  |  | (232) |  |  |
Earnings from continuing operations before taxes |  | (204) |  |  | 864 |  |  |
Provision for income taxes |  | (49) |  |  | 226 |  |  |
Net earnings |  | (155) |  |  | 638 |  |  |
Balance Without Adoption of ASU 2014-09 [Member] | ASC 606 [Member] |  |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |
Unreturned customer inventories |  | 0 |  |  | 0 |  |  |
Prepaid expenses and other current assets |  | 11,907 |  |  | 11,907 |  |  |
Accrued customer returns |  | 45,934 |  |  | 45,934 |  |  |
Accrued core liability |  | 16,165 |  |  | 16,165 |  |  |
Retained earnings |  | 382,054 |  |  | 382,054 |  |  |
Statement of Operations [Abstract] |  |  |  |  |  |  |  |
Net sales |  | 298,440 |  |  | 844,449 |  |  |
Cost of sales |  | 210,930 |  |  | 604,129 |  |  |
Earnings from continuing operations before taxes |  | 26,479 |  |  | 59,634 |  |  |
Provision for income taxes |  | 7,051 |  |  | 15,575 |  |  |
Net earnings |  | $ 15,904 |  |  | $ 39,045 |  |  |
[1] | The adoption of ASU 2014-09 using the modified retrospective method resulted in the recording of unreturned customer inventories commencing on January 1, 2018, see Note 2, "Summary of Significant Accounting Policies" for additional information.
[2] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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