Investment in Unconsolidated and Consolidated Joint Ventures - Condensed Statements of Operations and Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Statement of Operations
Joint Venture Revenues	$ 35,456	$ 36,842	$ 100,376	$ 98,907
Joint Venture Earnings (Loss)	3,653	2,479	8,187	3,548
TRC Equity in Earnings (Loss)	2,199	1,592	5,046	2,411
Balance Sheet Information
Joint Venture Assets	250,875		250,875		$ 214,155
Joint Venture Debt	(86,845)		(86,845)		(121,326)
Joint Venture Equity	104,847		104,847		87,568
TRC Equity	42,177		42,177		28,602
Petro Travel Plaza Holdings, LLC
Statement of Operations
Joint Venture Revenues	31,215	33,260	88,015	88,321
Joint Venture Earnings (Loss)	3,741	3,531	9,534	6,375
TRC Equity in Earnings (Loss)	2,244	2,119	5,720	3,825
Balance Sheet Information
Joint Venture Assets	78,570		78,570		69,096
Joint Venture Debt	(15,286)		(15,286)		(15,283)
Joint Venture Equity	60,909		60,909		51,377
TRC Equity	24,145		24,145		18,426
Five West Parcel, LLC
Statement of Operations
Joint Venture Revenues	780	662	2,200	2,057
Joint Venture Earnings (Loss)	321	180	732	597
TRC Equity in Earnings (Loss)	160	90	366	298
Balance Sheet Information
Joint Venture Assets	15,651		15,651		15,157
Joint Venture Debt	(8,769)		(8,769)		(9,173)
Joint Venture Equity	6,482		6,482		5,751
TRC Equity	3,057		3,057		2,691
18-19 West, LLC
Statement of Operations
Joint Venture Revenues	5	4	12	10
Joint Venture Earnings (Loss)	(26)	(24)	(80)	(77)
TRC Equity in Earnings (Loss)	(13)	(12)	(40)	(38)
Balance Sheet Information
Joint Venture Assets	4,632		4,632		4,654
Joint Venture Debt	0		0		0
Joint Venture Equity	4,627		4,627		4,654
TRC Equity	1,743		1,743		1,783
TRCC/Rock Outlet Center, LLC
Statement of Operations
Joint Venture Revenues	1,667	1,455	4,878	4,962
Joint Venture Earnings (Loss)	(730)	(958)	(2,849)	(3,312)
TRC Equity in Earnings (Loss)	(364)	(479)	(1,424)	(1,656)
Non-cash tenant allowance amortization	400	400	1,300	1,200
Balance Sheet Information
Joint Venture Assets	71,271		71,271		75,194
Joint Venture Debt	(39,393)		(39,393)		(46,826)
Joint Venture Equity	30,682		30,682		27,531
TRC Equity	7,278		7,278		5,702
TRC-MRC 1, LLC
Statement of Operations
Joint Venture Revenues	781	417	2,283	556
Joint Venture Earnings (Loss)	30	(324)	51	(426)
TRC Equity in Earnings (Loss)	14	(162)	25	(213)
Balance Sheet Information
Joint Venture Assets	29,118		29,118		29,692
Joint Venture Debt	(24,667)		(24,667)		(25,030)
Joint Venture Equity	3,839		3,839		4,018
TRC Equity	0		0		0
TRC-MRC 2, LLC
Statement of Operations
Joint Venture Revenues	1,008	1,044	2,988	3,001
Joint Venture Earnings (Loss)	317	74	799	391
TRC Equity in Earnings (Loss)	158	36	399	195
Balance Sheet Information
Joint Venture Assets	20,255		20,255		20,362
Joint Venture Debt	24,597		24,597		(25,014)
Joint Venture Equity	(7,746)		(7,746)		(5,763)
TRC Equity	0		0		0
TRC-MRC 3, LLC
Balance Sheet Information
Joint Venture Assets	31,378		31,378		0
Joint Venture Debt	(23,327)		(23,327)		0
Joint Venture Equity	6,054		6,054		0
TRC Equity	5,954		5,954		0
Centennial
Statement of Operations
Joint Venture Revenues	97	199	333	210
Joint Venture Earnings (Loss)	(128)	$ (12)	(36)	$ (224)
Balance Sheet Information
Joint Venture Assets	95,789		95,789		93,840
Joint Venture Debt	0		0		0
Joint Venture Equity	$ 95,462		$ 95,462		$ 93,188