Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Component of Other Income, Nonoperating [Line Items]
Other Income, Net	$ 14,495	$ 6,853	$ 14,243
Equity income from investments in Trinidad [Member]
Component of Other Income, Nonoperating [Line Items]
Other Income, Net	20,000	17,000
Interest Income [Member]
Component of Other Income, Nonoperating [Line Items]
Other Income, Net	9,000
Foreign Currency Gain (Loss) [Member]
Component of Other Income, Nonoperating [Line Items]
Other Income, Net	7,000
Equity losses on investment in Canada [Member]
Component of Other Income, Nonoperating [Line Items]
Other Income, Net	9,000	5,000
Sales of Warehouse Stock Gains (Losses) [Member]
Component of Other Income, Nonoperating [Line Items]
Other Income, Net	$ 10,000	$ 5,000