Income Taxes Valuation Allowance (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
UNITED STATES
Valuation Allowance [Line Items]
Tax Valuation Allowance Expense, Federal	$ 557,087
CANADA
Valuation Allowance [Line Items]
Tax Valuation Allowance Expense, Federal	$ 62,117