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Stock Compensation - Restricted Stock and Performance Share Grants - Compensation Costs (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation costs $ 989us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost $ 649us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
1998 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation costs, expensed 741us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= trc_StockIncentivePlan1998Member		 433us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= trc_StockIncentivePlan1998Member
Stock compensation costs, capitalized 36us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_PlanNameAxis
= trc_StockIncentivePlan1998Member		 31us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_PlanNameAxis
= trc_StockIncentivePlan1998Member
Stock compensation costs 777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_PlanNameAxis
= trc_StockIncentivePlan1998Member		 464us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_PlanNameAxis
= trc_StockIncentivePlan1998Member
NDSI Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation costs, expensed $ 212us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= trc_NonEmployeeDirectorStockIncentivePlanMember		 $ 185us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= trc_NonEmployeeDirectorStockIncentivePlanMember