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Income Tax (Sources of Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			132 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest, Total	$ (90,803)	$ 87,068	$ (20,020)	$ (79,817)
U.S.
Federal Income Tax Expense (Benefit), Continuing Operations	(52,448)	109,895	(2,469)
Foreign Tax Authority [Member]
Foreign Income Tax Expense (Benefit), Continuing Operations	(26,393)	(21,842)	(12,494)
Canada [Member]
Foreign Income Tax Expense (Benefit), Continuing Operations	$ (11,962)	$ (985)	$ (5,057)

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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