Reportable Business Segments (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Reportable Business Segments (Textual) [Abstract]
Number Of Business Segments	3
Revenue From Transactions With Major Customers	$ 0		$ 0		$ 0
Minimum Percentage Of Consolidated Net Sales From Single Customer	10.00%		10.00%		10.00%
Capital Lease Obligations	0		0		0
Income from Equity Method Investments	10,500,000		9,600,000		10,100,000
Residential Heating & Cooling and Commercial Heating & Cooling [Member]
Reportable Business Segments (Textual) [Abstract]
Income from Equity Method Investments	$ 5,000,000	[1]	$ 4,900,000	[1]	$ 5,600,000	[1]

[1] A significant portion of income for equity method investments is allocated to our Residential Heating & Cooling and Commercial Heating & Cooling segments. We allocated $5.0 million, $4.9 million and $5.6 million to those segments in 2012, 2011 and 2010 respectively.