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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.