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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Statement of Operations
Joint Venture Revenues	$ 36,842	$ 35,636	$ 98,907	$ 101,406
Joint Venture Earnings (Loss)	2,479	2,794	3,548	5,466
TRC Equity in Earnings (Loss)	1,592	1,724	2,411	3,512
Balance Sheet Information
Joint Venture Assets	212,195		212,195		$ 215,203
Joint Venture Debt	(119,014)		(119,014)		(114,273)
Joint Venture Equity	88,012		88,012		96,107
TRC Equity	27,660		27,660		30,031
Petro Travel Plaza Holdings, LLC
Statement of Operations
Joint Venture Revenues	33,260	31,983	88,321	89,215
Joint Venture Earnings (Loss)	3,531	3,267	6,375	7,790
TRC Equity in Earnings (Loss)	2,119	1,960	3,825	4,674
Balance Sheet Information
Joint Venture Assets	66,317		66,317		67,435
Joint Venture Debt	(15,282)		(15,282)		(15,280)
Joint Venture Equity	48,079		48,079		49,705
TRC Equity	16,447		16,447		17,422
Five West Parcel, LLC
Statement of Operations
Joint Venture Revenues	662	703	2,057	2,121
Joint Venture Earnings (Loss)	180	222	597	722
TRC Equity in Earnings (Loss)	90	111	298	361
Balance Sheet Information
Joint Venture Assets	16,273		16,273		15,738
Joint Venture Debt	(9,307)		(9,307)		(9,711)
Joint Venture Equity	6,569		6,569		5,972
TRC Equity	3,100		3,100		2,802
18-19 West, LLC
Statement of Operations
Joint Venture Revenues	4	3	10	8
Joint Venture Earnings (Loss)	(24)	(25)	(77)	(79)
TRC Equity in Earnings (Loss)	(12)	(12)	(38)	(39)
Balance Sheet Information
Joint Venture Assets	4,633		4,633		4,704
Joint Venture Debt	0		0		0
Joint Venture Equity	4,627		4,627		4,704
TRC Equity	1,744		1,744		1,782
TRCC/Rock Outlet Center, LLC
Statement of Operations
Joint Venture Revenues	1,455	2,012	4,962	7,287
Joint Venture Earnings (Loss)	(958)	(61)	(3,312)	(1,152)
TRC Equity in Earnings (Loss)	(479)	(30)	(1,656)	(576)
Non-cash tenant allowance amortization	400	400	1,200	1,400
Balance Sheet Information
Joint Venture Assets	76,954		76,954		81,610
Joint Venture Debt	(47,312)		(47,312)		(48,769)
Joint Venture Equity	28,865		28,865		32,177
TRC Equity	6,369		6,369		8,025
TRC-MRC 1, LLC
Statement of Operations
Joint Venture Revenues	417	0	556	0
Joint Venture Earnings (Loss)	(324)	0	(426)	(2)
TRC Equity in Earnings (Loss)	(162)	0	(213)	(1)
Balance Sheet Information
Joint Venture Assets	26,586		26,586		25,380
Joint Venture Debt	(21,963)		(21,963)		(19,433)
Joint Venture Equity	4,115		4,115		4,541
TRC Equity	0		0		0
TRC-MRC 2, LLC
Statement of Operations
Joint Venture Revenues	1,044	935	3,001	2,775
Joint Venture Earnings (Loss)	74	(609)	391	(1,813)
TRC Equity in Earnings (Loss)	36	(305)	195	(907)
Non-cash amortization related to in-place leases	200	1,000	600	3,000
Balance Sheet Information
Joint Venture Assets	21,432		21,432		20,336
Joint Venture Debt	(25,150)		(25,150)		(21,080)
Joint Venture Equity	(4,243)		(4,243)		(992)
TRC Equity	0		0		0
Centennial
Statement of Operations
Joint Venture Revenues	199	179	210	180
Joint Venture Earnings (Loss)	(12)	$ 9	(224)	$ (308)
Balance Sheet Information
Joint Venture Assets	92,158		92,158		89,721
Joint Venture Debt	0		0		0
Joint Venture Equity	$ 91,763		$ 91,763		$ 88,862