Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Net operating losses (NOL) carryover	$ 33,973	$ 33,444
Depletion carryover	3,020	3,020
Share based compensation	48	28
Deferred book liabilities	1	1
Loan origination fees	60	41
Book vs. tax basis in investments	20,683	19,165
Capital loss carryover	2,688	2,688
Total gross deferred tax assets	60,473	58,387
Deferred tax liabilities:
Property and equipment	(824)	(753)
Net deferred tax assets	59,649	57,634
Less valuation allowances	(59,649)	(57,634)
Deferred tax liabilities, net of valuation allowance	$ 0	$ 0