Stock Compensation - Restricted Stock and Performance Share Grants - Performance Share Grants (Details) - Performance share grants	3 Months Ended
Mar. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Below threshold performance ( in shares)	0
Threshold performance (in shares)	180,345
Target performance (in shares)	456,853
Maximum performance (in shares)	699,996

Performance Awards Granted with Performance Conditions, Number of Shares to be Issued, Below Threshold Performance

No definition available.

Name:	trc_PerformanceAwardsGrantedWithPerformanceConditionsNumberOfSharesToBeIssuedBelowThresholdPerformance
Namespace Prefix:	trc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Performance Awards Granted with Performance Conditions, Maximum Number of Shares to be Issued, at Maximum Performance

+ References

No definition available.

+ Details

Name:	trc_PerformanceAwardsGrantedwithPerformanceConditionsMaximumNumberofSharestobeIssuedatMaximumPerformance
Namespace Prefix:	trc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Performance Awards Granted with Performance Conditions, Minimum Number of Shares to be Issued, at Threshold Performance

+ References

No definition available.

+ Details

Name:	trc_PerformanceAwardsGrantedwithPerformanceConditionsMinimumNumberofSharestobeIssuedatThresholdPerformance
Namespace Prefix:	trc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Performance Awards Granted with Performance Conditions, Number of Shares to be Issued, at Target Performance

+ References

No definition available.

+ Details

Name:	trc_PerformanceAwardsGrantedwithPerformanceConditionsNumberofSharestobeIssuedatTargetPerformance
Namespace Prefix:	trc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: