Investment in Unconsolidated and Consolidated Joint Ventures - Condensed Statements of Operations and Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Statement of Operations
Joint Venture Revenues	$ 35,209	$ 34,235	$ 64,920	$ 62,065
Joint Venture Earnings (Loss)	3,157	912	4,534	1,069
TRC Equity in Earnings (Loss)	1,971	652	2,847	819
Balance Sheet Information
Joint Venture Assets	239,467		239,467		$ 214,155
Joint Venture Debt	(134,180)		(134,180)		(121,326)
Joint Venture Equity	96,232		96,232		87,568
TRC Equity	37,151		37,151		28,602
Petro Travel Plaza Holdings, LLC
Statement of Operations
Joint Venture Revenues	31,394	30,384	56,800	55,061
Joint Venture Earnings (Loss)	3,923	1,957	5,793	2,844
TRC Equity in Earnings (Loss)	2,354	1,174	3,476	1,706
Balance Sheet Information
Joint Venture Assets	74,642		74,642		69,096
Joint Venture Debt	(15,285)		(15,285)		(15,283)
Joint Venture Equity	57,170		57,170		51,377
TRC Equity	21,902		21,902		18,426
Five West Parcel, LLC
Statement of Operations
Joint Venture Revenues	736	698	1,420	1,395
Joint Venture Earnings (Loss)	240	226	411	417
TRC Equity in Earnings (Loss)	120	112	206	208
Balance Sheet Information
Joint Venture Assets	15,083		15,083		15,157
Joint Venture Debt	(8,903)		(8,903)		(9,173)
Joint Venture Equity	6,162		6,162		5,751
TRC Equity	2,896		2,896		2,691
18-19 West, LLC
Statement of Operations
Joint Venture Revenues	4	3	7	6
Joint Venture Earnings (Loss)	(26)	(26)	(54)	(53)
TRC Equity in Earnings (Loss)	(13)	(13)	(27)	(26)
Balance Sheet Information
Joint Venture Assets	4,660		4,660		4,654
Joint Venture Debt	0		0		0
Joint Venture Equity	4,652		4,652		4,654
TRC Equity	1,756		1,756		1,783
TRCC/Rock Outlet Center, LLC
Statement of Operations
Joint Venture Revenues	1,313	2,032	3,211	3,507
Joint Venture Earnings (Loss)	(1,334)	(1,259)	(2,119)	(2,354)
TRC Equity in Earnings (Loss)	(667)	(629)	(1,060)	(1,177)
Non-cash tenant allowance amortization	400	400	900	800
Balance Sheet Information
Joint Venture Assets	72,146		72,146		75,194
Joint Venture Debt	(45,855)		(45,855)		(46,826)
Joint Venture Equity	25,412		25,412		27,531
TRC Equity	4,643		4,643		5,702
TRC-MRC 1, LLC
Statement of Operations
Joint Venture Revenues	766	139	1,502	139
Joint Venture Earnings (Loss)	26	(101)	21	(102)
TRC Equity in Earnings (Loss)	13	(50)	11	(51)
Balance Sheet Information
Joint Venture Assets	29,322		29,322		29,692
Joint Venture Debt	(24,811)		(24,811)		(25,030)
Joint Venture Equity	4,024		4,024		4,018
TRC Equity	0		0		0
TRC-MRC 2, LLC
Statement of Operations
Joint Venture Revenues	996	979	1,980	1,957
Joint Venture Earnings (Loss)	328	115	482	317
TRC Equity in Earnings (Loss)	164	58	241	159
Balance Sheet Information
Joint Venture Assets	20,007		20,007		20,362
Joint Venture Debt	(24,738)		(24,738)		(25,014)
Joint Venture Equity	(7,242)		(7,242)		(5,763)
TRC Equity	0		0		0
TRC-MRC 3, LLC
Balance Sheet Information
Joint Venture Assets	23,607		23,607		0
Joint Venture Debt	(14,588)		(14,588)		0
Joint Venture Equity	6,054		6,054		0
TRC Equity	5,954		5,954		0
Centennial
Statement of Operations
Joint Venture Revenues	114	(76)	236	11
Joint Venture Earnings (Loss)	28	$ (194)	92	$ (212)
Balance Sheet Information
Joint Venture Assets	95,115		95,115		93,840
Joint Venture Debt	0		0		0
Joint Venture Equity	$ 94,779		$ 94,779		$ 93,188