Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment, Net [Abstract]
Land	$ 18,576	$ 13,963
Building and improvements	173,933	137,658
Plant and equipment	2,829,049	2,131,933
Other	180,452	161,761
Property, plant and equipment, gross	3,202,010	2,445,315
Less: Accumulated depreciation	(1,379,255)	(1,287,050)
Property, plant and equipment, net, before construction in progress	1,822,755	1,158,265
Construction in progress	265,259	351,783
Property, plant and equipment, net	$ 2,088,014	$ 1,510,048