Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Warranty activity
Warranty reserves, beginning of the year	$ 7,844	$ 8,886	$ 9,548
Accruals for warranties issued during the year	6,439	3,656	3,208
Reductions related to pre-existing warranties	(5,611)	(3,042)	(2,680)
Warranties paid	(2,372)	(1,629)	(1,186)
Other (principally foreign currency translation)	(19)	(27)	(4)
Warranty reserves, beginning of the year	6,281	7,844	8,886
Self-insurance
Loss Contingencies [Line Items]
Insurance expense from continuing operations	15,000	13,600	19,100
Decrease in pre-tax insurance expense due to retrospective insurance reserve adjustments from continuing operations	5,400	8,500	$ 7,000
Liabilities for asserted and unasserted claims	37,100	41,800
Liabilities covered by insurance carriers	$ 3,500	$ 3,400