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Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Stock-based compensation	$ 347	$ 372
Investment	1,227	1,885
Alternative minimum tax credit	4,043
Oil and gas properties	(2,234)	913
Net long-term deferred tax assets	3,383us-gaap_DeferredTaxAssetsNetNoncurrent	3,170us-gaap_DeferredTaxAssetsNetNoncurrent
Coal properties	(44,964)	(46,474)
Net deferred tax liability	$ 41,581	$ 43,304

Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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