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		9 Months Ended
	Apr. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Balance Sheet Information
Joint venture assets		$ 537,064		$ 537,064			$ 539,422
Joint venture equity		445,007	$ 434,426	445,007	$ 434,426	$ 442,977	445,624	$ 435,061	$ 434,672
Net income (loss)		384	37	(626)	870
Other comprehensive income (loss)		202	(897)	(2,899)	(2,722)
Restricted stock issuance		0	0	0	0
Stock compensation		1,444	225	4,492	2,450
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation		0	0	(1,584)	(844)
Retained Earnings
Balance Sheet Information
Joint venture equity		84,610	75,520	84,610	75,520	84,212	85,227	75,473	74,647
Net income (loss)		398	47	(617)	873
Total Stockholders' Equity
Balance Sheet Information
Joint venture equity		429,641	419,053	429,641	419,053	427,597	430,249	419,678	419,296
Net income (loss)		398	47	(617)	873
Other comprehensive income (loss)		202	(897)	(2,899)	(2,722)
Stock compensation		1,444	225	4,492	2,450
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation		0	0	(1,584)	(844)
Accumulated Other Comprehensive (Loss) Income
Balance Sheet Information
Joint venture equity		(9,670)	(7,579)	(9,670)	(7,579)	(9,872)	(6,771)	(6,682)	(4,857)
Other comprehensive income (loss)		202	(897)	(2,899)	(2,722)
Common Stock
Balance Sheet Information
Joint venture equity		$ 13,114	$ 13,021	$ 13,114	$ 13,021	13,110	13,048	13,017	12,986
Restricted stock issuance (in shares)		7,445	8,128	247,720	114,599
Restricted stock issuance		$ 4	$ 4	$ 124	$ 57
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		0	0	(115,210)	(45,149)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation				$ (58)	$ (22)
Additional Paid-In Capital
Balance Sheet Information
Joint venture equity		$ 341,587	$ 338,091	341,587	338,091	$ 340,147	338,745	$ 337,870	$ 336,520
Restricted stock issuance		(4)	(4)	(124)	(57)
Stock compensation		1,444	225	4,492	2,450
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation		0	0	(1,526)	(822)
TRCC/Rock Outlet Center, LLC
Statement of Operations
Non-cash tenant allowance amortization		400	400	1,000	1,300
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		27,597	35,456	75,259	100,376
Joint venture earnings (loss)		1,724	3,653	5,802	8,187
TRC equity in earnings (loss)		1,093	2,199	3,629	5,046
Balance Sheet Information
Joint venture assets		239,400		239,400			238,828
Joint venture debt		(134,249)		(134,249)			(131,254)
Joint venture equity		94,472		94,472			97,578
TRC equity		37,163		37,163			38,240
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Petro Travel Plaza Holdings, LLC
Statement of Operations
Total revenues		23,087	31,215	63,001	88,015
Joint venture earnings (loss)		2,311	3,741	7,280	9,534
TRC equity in earnings (loss)		1,387	2,244	4,368	5,720
Balance Sheet Information
Joint venture assets		75,646		75,646			77,835
Joint venture debt		(15,034)		(15,034)			(15,287)
Joint venture equity		57,341		57,341			60,061
TRC equity		22,004		22,004			23,636
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Five West Parcel, LLC
Statement of Operations
Total revenues		0	780	0	2,200
Joint venture earnings (loss)		(5)	321	13	732
TRC equity in earnings (loss)		(3)	160	6	366
Balance Sheet Information
Joint venture assets		43		43			694
Joint venture debt		0		0			0
Joint venture equity		43		43			648
TRC equity		0		0			140
Equity Method Investment, Nonconsolidated Investee or Group of Investees | 18-19 West, LLC
Statement of Operations
Total revenues		1	5	5	12
Joint venture earnings (loss)		(37)	(26)	(101)	(80)
TRC equity in earnings (loss)		(18)	(13)	(50)	(40)
Balance Sheet Information
Joint venture assets		4,637		4,637			4,849
Joint venture debt		0		0			0
Joint venture equity		4,379		4,379			4,600
TRC equity		1,619		1,619			1,730
Equity Method Investment, Nonconsolidated Investee or Group of Investees | TRCC/Rock Outlet Center, LLC
Statement of Operations
Total revenues		1,042	1,667	3,834	4,878
Joint venture earnings (loss)		(1,667)	(730)	(3,507)	(2,849)
TRC equity in earnings (loss)		(834)	(364)	(1,754)	(1,424)
Balance Sheet Information
Joint venture assets		66,827		66,827			69,459
Joint venture debt		(35,286)		(35,286)			(38,909)
Joint venture equity		30,281		30,281			29,688
TRC equity		7,076		7,076			6,781
Equity Method Investment, Nonconsolidated Investee or Group of Investees | TRC-MRC 1, LLC
Statement of Operations
Total revenues		759	781	2,332	2,283
Joint venture earnings (loss)		12	30	81	51
TRC equity in earnings (loss)		6	14	41	25
Balance Sheet Information
Joint venture assets		28,507		28,507			28,673
Joint venture debt		(24,126)		(24,126)			(24,542)
Joint venture equity		3,611		3,611			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		1,033	1,008	3,056	2,988
Joint venture earnings (loss)		344	317	1,014	799
TRC equity in earnings (loss)		172	158	507	399
Balance Sheet Information
Joint venture assets		20,504		20,504			20,026
Joint venture debt		(24,018)		(24,018)			(24,455)
Joint venture equity		(8,257)		(8,257)			(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		1,675	0	3,031	0
Joint venture earnings (loss)		766	0	1,022	0
TRC equity in earnings (loss)		383	0	511	0
Balance Sheet Information
Joint venture assets		43,236		43,236			37,292
Joint venture debt		(35,785)		(35,785)			(28,061)
Joint venture equity		7,074		7,074			6,052
TRC equity		6,464		6,464			5,953
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Centennial
Statement of Operations
Total revenues		53	97	285	333
Joint venture earnings (loss)		(188)	$ (128)	(121)	$ (36)
Balance Sheet Information
Joint venture assets		98,130		98,130			96,415
Joint venture debt		0		0			0
Joint venture equity		$ 97,547		$ 97,547			$ 96,143