Property, Plant And Equipment (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Depreciation expense on property, plant and equipment	$ 129,222	$ 120,924	$ 110,268
Asset impairment charges	0	0	1,975
Pvc Pipe Facilities [Member]
Property, Plant and Equipment [Line Items]
Asset impairment charges			1,975
Pvc Pipe Facilities [Member]
Property, Plant and Equipment [Line Items]
Severance Costs			$ 1,389