Financial Instruments (Fair Values Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	$ 3,170	$ 2,409
Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	3,170	2,409
Derivatives not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	0	480
Other assets (non-current) [Member] | Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	3,170	2,409
Receivables, net [Member] | Derivatives not designated as hedging instruments [Member] | Lumber contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	$ 0	$ 480