Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Warranty activity
Warranty reserves, beginning of the year	$ 9,092,000	$ 5,596,000	$ 5,037,000
Accruals for warranties issued during the year	5,016,000	7,935,000	4,003,000
Reductions related to pre-existing warranties	(1,966,000)	(2,401,000)	(1,769,000)
Warranties paid	(2,573,000)	(1,958,000)	(1,677,000)
Other (principally foreign currency translation)	(21,000)	(80,000)	2,000
Warranty reserves, beginning of the year	9,548,000	9,092,000	5,596,000
Self-insurance
Loss Contingencies [Line Items]
Insurance expense from continuing operations	30,000,000	33,800,000	37,000,000
Decrease in pre-tax insurance expense due to retrospective insurance reserve adjustments from continuing operations	7,200,000	4,300,000	2,700,000
Liabilities for asserted and unasserted claims	52,400,000	82,700,000
Liabilities covered by insurance carriers	$ 4,000,000