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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Balance Sheet [Abstract] |  |  |  |  |  |  |  |
Unreturned customer inventories |  | $ 18,246 | [1] |  | $ 18,246 | [1] |  | $ 0
Prepaid expenses and other current assets |  | 16,458 |  |  | 16,458 |  |  | 12,300
Accrued customer returns |  | 42,536 |  |  | 42,536 |  |  | 35,916
Accrued core liability |  | 26,138 |  |  | 26,138 |  |  | 11,899
Retained earnings |  | 370,461 |  |  | 370,461 |  |  | 357,153
Statement of Operations [Abstract] |  |  |  |  |  |  |  |
Net sales | [2] | 286,636 |  | $ 312,729 | 548,462 |  | $ 595,107 |
Cost of sales |  | 205,347 |  | 222,063 | 394,584 |  | 420,331 |
Earnings from continuing operations before taxes |  | 22,579 |  | 29,687 | 34,223 |  | 55,561 |
Provision for income taxes |  | 5,752 |  | 11,426 | 8,799 |  | 20,933 |
Net earnings |  | 15,945 |  | $ 17,764 | 23,934 |  | $ 33,498 |
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 |  | 18,246 |  |  | 18,246 |  |  | 19,950
Prepaid expenses and other current assets |  | (275) |  |  | (275) |  |  |
Accrued customer returns |  | 6,352 |  |  | 6,352 |  |  | 6,670
Accrued core liability |  | 12,015 |  |  | 12,015 |  |  | 14,469
Retained earnings |  | (396) |  |  | (396) |  |  | $ (1,189)
Statement of Operations [Abstract] |  |  |  |  |  |  |  |
Net sales |  | 105 |  |  | 2,453 |  |  |
Cost of sales |  | (434) |  |  | 1,385 |  |  |
Earnings from continuing operations before taxes |  | 539 |  |  | 1,068 |  |  |
Provision for income taxes |  | 137 |  |  | 275 |  |  |
Net earnings |  | 402 |  |  | 793 |  |  |
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 |  | 16,733 |  |  | 16,733 |  |  |
Accrued customer returns |  | 36,184 |  |  | 36,184 |  |  |
Accrued core liability |  | 14,123 |  |  | 14,123 |  |  |
Retained earnings |  | 370,857 |  |  | 370,857 |  |  |
Statement of Operations [Abstract] |  |  |  |  |  |  |  |
Net sales |  | 286,531 |  |  | 546,009 |  |  |
Cost of sales |  | 205,781 |  |  | 393,199 |  |  |
Earnings from continuing operations before taxes |  | 22,040 |  |  | 33,155 |  |  |
Provision for income taxes |  | 5,615 |  |  | 8,524 |  |  |
Net earnings |  | $ 15,543 |  |  | $ 23,141 |  |  |
[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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