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Federal income tax expense differs from the amount computed as follows (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Federal income tax expense differs from the amount computed as follows:      
Computed "expected" income tax (benefit) expense $ 14,061us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 15,684us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ (1,955)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Book to tax differences in gains on sale of property (2,350)fil_BookToTaxDifferencesInGainsOnSaleOfProperty (20,373)fil_BookToTaxDifferencesInGainsOnSaleOfProperty (8,503)fil_BookToTaxDifferencesInGainsOnSaleOfProperty
Book to tax differences from entities not consolidated for tax purposes (23,900)fil_BookToTaxDifferencesFromEntitiesNotConsolidatedForTaxPurposes (33,565)fil_BookToTaxDifferencesFromEntitiesNotConsolidatedForTaxPurposes (3,831)fil_BookToTaxDifferencesFromEntitiesNotConsolidatedForTaxPurposes
Book to tax differences of depreciation and amortization 1,415fil_BookToTaxDifferencesOfDepreciationAndAmortization 1,250fil_BookToTaxDifferencesOfDepreciationAndAmortization 1,460fil_BookToTaxDifferencesOfDepreciationAndAmortization
Valuation allowance against current net operating loss benefit 20,125fil_ValuationAllowanceAgainstCurrentNetOperatingLossBenefit 17,415fil_ValuationAllowanceAgainstCurrentNetOperatingLossBenefit 5,387fil_ValuationAllowanceAgainstCurrentNetOperatingLossBenefit
Other book to tax differences (9,351)fil_OtherBookToTaxDifferences 17,208fil_OtherBookToTaxDifferences 7,442fil_OtherBookToTaxDifferences
Total 0us-gaap_CurrentFederalTaxExpenseBenefit (2,381)us-gaap_CurrentFederalTaxExpenseBenefit 0us-gaap_CurrentFederalTaxExpenseBenefit
Alternative minimum tax $ 0fil_AlternativeMinimumTax $ 0fil_AlternativeMinimumTax $ 0fil_AlternativeMinimumTax