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Other Current Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Liabilities, Current [Abstract]      
Taxes, other than income taxes $ 14,760 $ 7,122  
Warranty 12,676 10,960  
Deferred revenue 5,815 2,366  
Rebates 13,466 11,102  
Freight 3,208 4,274  
Severance and Restructuring 4,267 394  
Miscellaneous accrued expenses 10,779 4,385  
Other 4,476 3,014  
Total 69,447 43,617  
Changes in warranty reserves      
Beginning balance 10,960 10,093 $ 9,686
Product warranty provision 12,124 12,413 11,719
Acquired Warranty Obligations 1,208 42 0
Foreign currency 274 82 (207)
Claims paid (11,890) (11,670) (11,105)
Ending balance $ 12,676 $ 10,960 $ 10,093