Available For Sale Investments (Details)	12 Months Ended			0 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Feb. 02, 2012 Riverstone Resources, Inc.	Feb. 02, 2012 Riverstone Resources, Inc. Warrant Exercised [Member] USD ($)	Feb. 02, 2012 Riverstone Resources, Inc. Warrant Exercised [Member] CAD	Feb. 02, 2012 Riverstone Resources, Inc. Sale of Business USD ($)
Schedule of Available-for-sale Securities [Roll Forward]
Balance at beginning of period	$ 1,416,000	$ 928,000
Balance at beginning of period (shares)	2,000,000	1,300,000
Acquisitions	17,117,000	469,000			1,300,000		15,800,000
Acquisitions (shares)	23,676,301	700,000		2,000,000
Dispositions	(805,000)	0
Dispositions (shares)	(1,155,200)	0
OCI - unrealized gain/(loss)	(2,694,000)	19,000
Balance at end of period	15,034,000	1,416,000	928,000
Balance at end of period (shares)	24,521,101	2,000,000	1,300,000
Warrants exercise price (CDN$ per share)						0.45
Cash consideration for warrants exercised						900,000
Cash generated from sale of subsidiary							6,600,000
Shares generated from sale (shares)							21,700,000
Loss related to investment holdings recognized through Comprehensive Income	$ 2,694,000	$ (19,000)	$ (619,000)