Income Taxes (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Income Tax expense recognized from 2009 audit	$ 0	$ 310,000
Tax adjustment assessed		619,000
Expiration dates of operating loss carryforwards	2032
U.S. tax [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		169,600,000
Canadian Tax [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 15,000,000