Investment in Unconsolidated and Consolidated Joint Ventures Investment in Unconsolidated and Consolidated Joint Ventures - Condensed Statements of Operations and Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Statement of Operations
Joint Venture Revenues	$ 27,830	$ 30,610
Joint Venture Earnings (Loss)	157	161
TRC Equity in Earnings (Loss)	167	228
Balance Sheet Information
Joint Venture Assets	215,084		$ 215,203
Joint Venture Debt	(115,301)		(114,273)
Joint Venture Equity	95,901		96,107
TRC Equity	30,098		30,031
Petro Travel Plaza Holdings, LLC
Statement of Operations
Joint Venture Revenues	24,677	26,407
Joint Venture Earnings (Loss)	887	1,502
TRC Equity in Earnings (Loss)	532	901
Balance Sheet Information
Joint Venture Assets	68,283		67,435
Joint Venture Debt	(15,280)		(15,280)
Joint Venture Equity	50,592		49,705
TRC Equity	17,955		17,422
Five West Parcel, LLC
Statement of Operations
Joint Venture Revenues	697	716
Joint Venture Earnings (Loss)	191	269
TRC Equity in Earnings (Loss)	96	134
Balance Sheet Information
Joint Venture Assets	15,922		15,738
Joint Venture Debt	(9,577)		(9,711)
Joint Venture Equity	6,163		5,972
TRC Equity	2,897		2,802
18-19 West, LLC
Statement of Operations
Joint Venture Revenues	3	3
Joint Venture Earnings (Loss)	(27)	(24)
TRC Equity in Earnings (Loss)	(13)	(13)
Balance Sheet Information
Joint Venture Assets	4,683		4,704
Joint Venture Debt	0		0
Joint Venture Equity	4,678		4,704
TRC Equity	1,769		1,782
TRCC/Rock Outlet Center
Schedule of Equity Method Investments [Line Items]
Non-cash tenant allowance amortization	400	500
Statement of Operations
Joint Venture Revenues	1,475	2,549
Joint Venture Earnings (Loss)	(1,095)	(1,009)
TRC Equity in Earnings (Loss)	(548)	(505)
Balance Sheet Information
Joint Venture Assets	80,221		81,610
Joint Venture Debt	(48,284)		(48,769)
Joint Venture Equity	31,081		32,177
TRC Equity	7,477		8,025
TRC-MRC 1, LLC
Statement of Operations
Joint Venture Revenues	0	0
Joint Venture Earnings (Loss)	(1)	(2)
TRC Equity in Earnings (Loss)	(1)	(1)
Balance Sheet Information
Joint Venture Assets	25,652		25,380
Joint Venture Debt	(21,080)		(19,433)
Joint Venture Equity	4,540		4,541
TRC Equity	0		0
TRC-MRC 2 LLC
Schedule of Equity Method Investments [Line Items]
Non-cash amortization related to in-place leases	200	1,000
Statement of Operations
Joint Venture Revenues	978	935
Joint Venture Earnings (Loss)	202	(575)
TRC Equity in Earnings (Loss)	101	(288)
Balance Sheet Information
Joint Venture Assets	20,323		20,336
Joint Venture Debt	21,080		(21,080)
Joint Venture Equity	(1,153)		(992)
TRC Equity	0		0
Centennial
Statement of Operations
Joint Venture Revenues	87	1
Joint Venture Earnings (Loss)	(18)	$ (110)
Balance Sheet Information
Joint Venture Assets	90,002		89,721
Joint Venture Debt	0		0
Joint Venture Equity	$ 89,569		$ 88,862