Property, Plant And Equipment (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Construction of assets pending sale-leaseback	$ 2,004
Depreciation expense on property, plant and equipment	120,924	110,268	105,744
Asset impairment charges	0	1,975	0
PVC Pipe Facilities [Member]
Property, Plant and Equipment [Line Items]
Asset impairment charges		$ 1,975