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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Balance Sheet [Abstract] |  |  |  |  |
Unreturned customer inventories |  | $ 18,674 | [1] |  | $ 0
Prepaid expenses and other current assets |  | 12,672 |  |  | 12,300
Accrued customer returns |  | 43,031 |  |  | 35,916
Accrued core liability |  | 23,751 |  |  | 11,899
Retained earnings |  | 359,232 |  |  | 357,153
Statement of Operations [Abstract] |  |  |  |  |
Net sales | [2] | 261,826 |  | $ 282,378 |
Cost of sales |  | 189,237 |  | 198,268 |
Earnings from continuing operations before taxes |  | 11,644 |  | 25,874 |
Provision for income taxes |  | 3,047 |  | 9,507 |
Net earnings |  | 7,989 |  | $ 15,734 |
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 |  | 18,674 |  |  | 19,950
Prepaid expenses and other current assets |  | (138) |  |  |
Accrued customer returns |  | 7,214 |  |  | 6,670
Accrued core liability |  | 12,120 |  |  | 14,469
Retained earnings |  | (798) |  |  | $ (1,189)
Statement of Operations [Abstract] |  |  |  |  |
Net sales |  | 2,348 |  |  |
Cost of sales |  | 1,819 |  |  |
Earnings from continuing operations before taxes |  | 529 |  |  |
Provision for income taxes |  | 138 |  |  |
Net earnings |  | 391 |  |  |
Balance Without Adoption of ASU 2014-09 [Member] | ASC 606 [Member] |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |
Unreturned customer inventories |  | 0 |  |  |
Prepaid expenses and other current assets |  | 12,810 |  |  |
Accrued customer returns |  | 35,817 |  |  |
Accrued core liability |  | 11,631 |  |  |
Retained earnings |  | 360,030 |  |  |
Statement of Operations [Abstract] |  |  |  |  |
Net sales |  | 259,478 |  |  |
Cost of sales |  | 187,418 |  |  |
Earnings from continuing operations before taxes |  | 11,115 |  |  |
Provision for income taxes |  | 2,909 |  |  |
Net earnings |  | $ 7,598 |  |  |
[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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