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 [Abstract]
Capitalized interest included in property, plant and equipment	$ 4,577	$ 6,197	$ 4,240
Depreciation expense	217,393	220,580	218,649
Capital leases included in the property, plant and equipment, cost	7,219	7,803
Capital leases included in the property, plant and equipment, accumulated depreciation	$ 5,581	$ 5,881