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Other Current Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Taxes, other than income taxes     $ 7,122 $ 5,030  
Warranty     10,960 10,093  
Deferred revenue     2,366 2,512  
Rebates     11,102 10,399  
Freight     4,274 6,461  
Severance and Restructuring     394 1,927  
Miscellaneous accrued expenses     4,385 4,230  
Other     3,014 2,491  
Less: Other Current Liabilities held for sale     0 116  
Total $ 63,327   43,617 43,027  
Changes in warranty reserves          
Beginning balance 10,960 $ 10,093 10,093 9,686 $ 9,663
Product warranty provision 8,879 8,888 12,413 11,719 10,605
Acquired Warranty Obligations 384 0 42 0 0
Foreign currency 225 85 82 (207) (215)
Claims paid (8,912) (8,707) (11,670) (11,105) (10,367)
Ending balance $ 11,536 $ 10,359 $ 10,960 $ 10,093 $ 9,686