Property, Plant and Equipment Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Property, Plant and Equipment [Abstract]
Property, plant and equipment additions	$ 123,935	$ 104,993
Net change in related accounts payable and deposits	(2,848)	8,888
Purchases of property, plant, and equipment	$ 121,087	$ 113,881