Investment in Unconsolidated and Consolidated Joint Ventures - Condensed Statements of Operations and Balance Sheet Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Information
Joint Venture Assets		$ 535,170		$ 535,170			$ 539,422
Joint Venture Equity		442,977	$ 435,061	442,977	$ 435,061	$ 442,133	445,624	$ 434,694	$ 434,672
TRCC/Rock Outlet Center, LLC
Statement of Operations
Non-cash tenant allowance amortization		300	400	600	900
TRC-MRC 3, LLC
Statement of Operations
Joint Venture Earnings(Loss)	$ 1,500
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Statement of Operations
Total revenues		20,151	35,209	47,662	64,920
Joint Venture Earnings(Loss)		1,874	3,157	4,078	4,534
TRC Equity in Earnings (Loss)		1,181	1,971	2,536	2,847
Balance Sheet Information
Joint Venture Assets		246,734		246,734			238,828
Joint Venture Debt		(137,469)		(137,469)			(131,254)
Joint Venture Equity		100,891		100,891			97,578
TRC Equity		41,246		41,246			38,240
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Petro Travel Plaza Holdings, LLC
Statement of Operations
Total revenues		16,701	31,394	39,914	56,800
Joint Venture Earnings(Loss)		2,430	3,923	4,969	5,793
TRC Equity in Earnings (Loss)		1,458	2,354	2,981	3,476
Balance Sheet Information
Joint Venture Assets		81,774		81,774			77,835
Joint Venture Debt		(15,225)		(15,225)			(15,287)
Joint Venture Equity		65,030		65,030			60,061
TRC Equity		26,618		26,618			23,636
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Five West Parcel, LLC
Statement of Operations
Total revenues		0	736	0	1,420
Joint Venture Earnings(Loss)		19	240	18	411
TRC Equity in Earnings (Loss)		10	120	9	206
Balance Sheet Information
Joint Venture Assets		666		666			694
Joint Venture Debt		0		0			0
Joint Venture Equity		666		666			648
TRC Equity		149		149			140
Equity Method Investment, Nonconsolidated Investee or Group of Investees | 18-19 West, LLC
Statement of Operations
Total revenues		1	4	4	7
Joint Venture Earnings(Loss)		(34)	(26)	(64)	(54)
TRC Equity in Earnings (Loss)		(17)	(13)	(32)	(27)
Balance Sheet Information
Joint Venture Assets		4,665		4,665			4,849
Joint Venture Debt		0		0			0
Joint Venture Equity		4,415		4,415			4,600
TRC Equity		1,637		1,637			1,730
Equity Method Investment, Nonconsolidated Investee or Group of Investees | TRCC/Rock Outlet Center, LLC
Statement of Operations
Total revenues		929	1,313	2,792	3,211
Joint Venture Earnings(Loss)		(1,028)	(1,334)	(1,840)	(2,119)
TRC Equity in Earnings (Loss)		(514)	(667)	(920)	(1,060)
Balance Sheet Information
Joint Venture Assets		68,244		68,244			69,459
Joint Venture Debt		(38,027)		(38,027)			(38,909)
Joint Venture Equity		29,649		29,649			29,688
TRC Equity		6,761		6,761			6,781
Equity Method Investment, Nonconsolidated Investee or Group of Investees | TRC-MRC 1, LLC
Statement of Operations
Total revenues		786	766	1,573	1,502
Joint Venture Earnings(Loss)		29	26	69	21
TRC Equity in Earnings (Loss)		15	13	35	11
Balance Sheet Information
Joint Venture Assets		28,589		28,589			28,673
Joint Venture Debt		(24,267)		(24,267)			(24,542)
Joint Venture Equity		3,599		3,599			3,623
TRC Equity		0		0			0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | TRC-MRC 2, LLC
Statement of Operations
Total revenues		1,003	996	2,023	1,980
Joint Venture Earnings(Loss)		327	328	670	482
TRC Equity in Earnings (Loss)		163	164	335	241
Balance Sheet Information
Joint Venture Assets		20,171		20,171			20,026
Joint Venture Debt		(24,165)		(24,165)			(24,455)
Joint Venture Equity		(8,776)		(8,776)			(7,094)
TRC Equity		0		0			0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | TRC-MRC 3, LLC
Statement of Operations
Total revenues		731	0	1,356	0
Joint Venture Earnings(Loss)		131	0	256	0
TRC Equity in Earnings (Loss)		66	0	128	0
Balance Sheet Information
Joint Venture Assets		42,625		42,625			37,292
Joint Venture Debt		(35,785)		(35,785)			(28,061)
Joint Venture Equity		6,308		6,308			6,052
TRC Equity		6,081		6,081			5,953
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Centennial
Statement of Operations
Total revenues		185	114	232	236
Joint Venture Earnings(Loss)		94	$ 28	67	$ 92
Balance Sheet Information
Joint Venture Assets		97,529		97,529			96,415
Joint Venture Debt		0		0			0
Joint Venture Equity		$ 97,135		$ 97,135			$ 96,143