Other Current Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities, Current [Abstract]
Taxes, other than income taxes	$ 12,763	$ 14,760
Warranty	13,062	12,676
Deferred revenue	5,021	5,815
Rebates	16,652	13,466
Freight	4,475	3,208
Severance and Restructuring	2,248	4,267
Miscellaneous accrued expenses	13,117	10,779
Other	4,557	4,476
Total	71,895	69,447
Changes in warranty reserves
Beginning balance	12,676	10,960	$ 10,093
Product warranty provision	13,172	12,124	12,413
Acquired Warranty Obligations	0	1,208	42
Foreign currency	(172)	274	82
Claims paid	(12,614)	(11,890)	(11,670)
Ending balance	$ 13,062	$ 12,676	$ 10,960