Investment in Unconsolidated and Consolidated Joint Ventures - Condensed Statements of Operations and Balance Sheet Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Statement of Operations
Equity in earnings (losses)	$ 1,150,000	$ 438,000
Balance Sheet Information
Current assets	66,366,000		65,927,000
Property and equipment, net	43,453,000		43,094,000
Long-term debt	(78,060,000)		(81,309,000)
Unconsolidated Properties [Member]
Statement of Operations
Revenues	24,932,000	25,913,000
Net income (loss)	1,913,000	676,000
Partner’s share of net income (loss)	763,000	238,000
Equity in earnings (losses)	1,150,000	438,000
Balance Sheet Information
Current assets	26,306,000		25,101,000
Property and equipment, net	133,217,000		133,609,000
Other assets	21,004,000		19,872,000
Long-term debt	(77,738,000)		(72,257,000)
Other liabilities	(5,024,000)		(8,321,000)
Net assets	97,765,000		98,004,000
Petro Travel Plaza Holdings LLC
Statement of Operations
Revenues	21,861,000	25,053,000
Net income (loss)	1,934,000	998,000
Partner’s share of net income (loss)	774,000	399,000
Equity in earnings (losses)	1,160,000	599,000
Balance Sheet Information
Current assets	20,131,000		18,960,000
Property and equipment, net	48,170,000		48,011,000
Other assets	0		181,000
Long-term debt	(15,604,000)		(15,808,000)
Other liabilities	(2,683,000)		(3,263,000)
Net assets	50,014,000		48,081,000
Five West Parcel LLC
Statement of Operations
Revenues	995,000	844,000
Net income (loss)	182,000	59,000
Partner’s share of net income (loss)	91,000	30,000
Equity in earnings (losses)	91,000	29,000
Balance Sheet Information
Current assets	2,489,000		3,834,000
Property and equipment, net	14,341,000		14,869,000
Other assets	74,000		67,000
Long-term debt	(11,000,000)		(11,000,000)
Other liabilities	(592,000)		(440,000)
Net assets	5,312,000		7,330,000
18-19 West LLC
Statement of Operations
Revenues	7,000	16,000
Net income (loss)	(2,000)	5,000
Partner’s share of net income (loss)	(1,000)	2,000
Equity in earnings (losses)	(1,000)	3,000
Balance Sheet Information
Current assets	33,000		5,000
Property and equipment, net	4,639,000		4,617,000
Other assets	0		0
Long-term debt	0		0
Other liabilities	(5,000)		(2,000)
Net assets	4,667,000		4,620,000
TRCC/Rock Outlet Center
Statement of Operations
Revenues	2,069,000	0
Net income (loss)	(201,000)	(344,000)
Partner’s share of net income (loss)	(101,000)	(172,000)
Equity in earnings (losses)	(100,000)	(172,000)
Balance Sheet Information
Current assets	3,653,000		2,302,000
Property and equipment, net	66,067,000		66,112,000
Other assets	20,930,000		19,624,000
Long-term debt	(51,134,000)		(45,449,000)
Other liabilities	(1,744,000)		(4,616,000)
Net assets	37,772,000		37,973,000
Tejon Mountain Village LLC
Statement of Operations
Revenues		0
Net income (loss)		(42,000)
Partner’s share of net income (loss)		(21,000)
Equity in earnings (losses)		(21,000)
Centennial Founders, LLC
Statement of Operations
Revenues	93,000	269,000
Net income (loss)	(62,000)	68,000
Partner’s share of net income (loss)	(16,000)	18,000
Equity in earnings (losses)	0	0
Balance Sheet Information
Current assets	103,000		651,000
Property and equipment, net	78,032,000		77,373,000
Other assets	14,000
Long-term debt
Other liabilities	(345,000)		(158,000)
Net assets	$ 77,804,000		$ 77,866,000