Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Warranty activity
Warranty reserves, beginning of the year	$ 5,243	$ 5,486	$ 6,001
Accruals for warranties issued during the year	4,134	3,837	4,533
Reductions related to pre-existing warranties	(2,748)	(3,320)	(3,428)
Standard Product Warranty Accrual, Additions from Business Acquisition	0	249	0
Warranties paid	(649)	(942)	(1,637)
Other (principally foreign currency translation)	(60)	(67)	17
Warranty reserves, beginning of the year	5,920	5,243	5,486
Self-insurance
Loss Contingencies [Line Items]
Insurance expense from continuing operations	15,400	13,500	16,000
Decrease in pre-tax insurance expense due to retrospective insurance reserve adjustments from continuing operations	1,500	2,000	$ 1,500
Liabilities for asserted and unasserted claims	28,700	60,300
Liabilities covered by insurance carriers	$ 3,700	$ 34,200