Investment in Unconsolidated and Consolidated Joint Ventures - Condensed Statements of Operations and Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Statement of Operations
Joint Venture Revenues	$ 29,711	$ 27,830
Joint Venture Earnings (Loss)	1,377	157
TRC Equity in Earnings (Loss)	876	167
Balance Sheet Information
Joint Venture Assets	218,113		$ 214,155
Joint Venture Debt	(120,483)		(121,326)
Joint Venture Equity	88,458		87,568
TRC Equity	29,503		28,602
Petro Travel Plaza Holdings, LLC
Statement of Operations
Joint Venture Revenues	25,406	24,677
Joint Venture Earnings (Loss)	1,870	887
TRC Equity in Earnings (Loss)	1,122	532
Balance Sheet Information
Joint Venture Assets	70,441		69,096
Joint Venture Debt	(15,284)		(15,283)
Joint Venture Equity	53,247		51,377
TRC Equity	19,548		18,426
Five West Parcel, LLC
Statement of Operations
Joint Venture Revenues	684	697
Joint Venture Earnings (Loss)	171	191
TRC Equity in Earnings (Loss)	86	96
Balance Sheet Information
Joint Venture Assets	15,125		15,157
Joint Venture Debt	(9,038)		(9,173)
Joint Venture Equity	5,922		5,751
TRC Equity	2,777		2,691
18-19 West, LLC
Statement of Operations
Joint Venture Revenues	3	3
Joint Venture Earnings (Loss)	(28)	(27)
TRC Equity in Earnings (Loss)	(14)	(13)
Balance Sheet Information
Joint Venture Assets	4,632		4,654
Joint Venture Debt	0		0
Joint Venture Equity	4,626		4,654
TRC Equity	1,769		1,783
TRCC/Rock Outlet Center, LLC
Statement of Operations
Joint Venture Revenues	1,898	1,475
Joint Venture Earnings (Loss)	(785)	(1,095)
TRC Equity in Earnings (Loss)	(393)	(548)
Non-cash tenant allowance amortization	500	400
Balance Sheet Information
Joint Venture Assets	74,062		75,194
Joint Venture Debt	(46,341)		(46,826)
Joint Venture Equity	26,746		27,531
TRC Equity	5,309		5,702
TRC-MRC 1, LLC
Statement of Operations
Joint Venture Revenues	736	0
Joint Venture Earnings (Loss)	(5)	(1)
TRC Equity in Earnings (Loss)	(2)	(1)
Balance Sheet Information
Joint Venture Assets	29,629		29,692
Joint Venture Debt	(24,943)		(25,030)
Joint Venture Equity	3,998		4,018
TRC Equity	0		0
TRC-MRC 2, LLC
Statement of Operations
Joint Venture Revenues	984	978
Joint Venture Earnings (Loss)	154	202
TRC Equity in Earnings (Loss)	77	101
Non-cash amortization related to in-place leases	200	200
Balance Sheet Information
Joint Venture Assets	20,358		20,362
Joint Venture Debt	(24,877)		(25,014)
Joint Venture Equity	(6,281)		(5,763)
TRC Equity	0		0
TRC-MRC 3, LLC
Balance Sheet Information
Joint Venture Assets	3,866		0
Joint Venture Debt	0		0
Joint Venture Equity	200		0
TRC Equity	100		0
Centennial
Statement of Operations
Joint Venture Revenues	122	87
Joint Venture Earnings (Loss)	64	$ (18)
Balance Sheet Information
Joint Venture Assets	94,397		93,840
Joint Venture Debt	0		0
Joint Venture Equity	$ 94,002		$ 93,188