Investment in Unconsolidated and Consolidated Joint Ventures (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Net income (loss)	$ 2,084,000	$ 118,000	$ 2,699,000	$ 393,000
Current assets	94,539,000		94,539,000		90,753,000
Property and equipment, net	140,013,000		140,013,000		146,590,000
Long-term debt	(233,000)		(233,000)		(253,000)
Total
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			57,068,000	60,029,000
Net income (loss)			2,207,000	1,257,000
Partner's share of net (income)			863,000	474,000
Equity in income (losses)			1,679,000	534,000
Current assets	22,136,000		22,136,000		10,031,000
Property and equipment, net	175,097,000		175,097,000		160,479,000
Other assets	878,000		878,000		929,000
Long-term debt	(27,988,000)		(27,988,000)		(28,358,000)
Other liabilities	(4,196,000)		(4,196,000)		(3,614,000)
Net assets	165,927,000		165,927,000		139,467,000
Petro Travel Plaza Holdings LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			55,364,000	59,001,000
Net income (loss)			2,394,000	1,540,000
Partner's share of net (income)			958,000	616,000
Equity in income (losses)			1,436,000	675,000
Current assets	11,256,000		11,256,000		9,577,000
Property and equipment, net	43,907,000		43,907,000		44,196,000
Other assets	227,000		227,000		246,000
Long-term debt	(16,988,000)		(16,988,000)		(17,358,000)
Other liabilities	(2,309,000)		(2,309,000)		(3,350,000)
Net assets	36,093,000		36,093,000		33,311,000
Five West Parcel LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			1,673,000	975,000
Net income (loss)			47,000	(282,000)
Partner's share of net (income)			23,000	(141,000)
Equity in income (losses)			24,000	(141,000)
Current assets	1,214,000		1,214,000		194,000
Property and equipment, net	18,111,000		18,111,000		19,025,000
Other assets	651,000		651,000		683,000
Long-term debt	(11,000,000)		(11,000,000)		(11,000,000)
Other liabilities	(67,000)		(67,000)		(39,000)
Net assets	8,909,000		8,909,000		8,863,000
Tejon Mountain Village LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			0	0
Net income (loss)			(83,000)	(47,000)
Partner's share of net (income)			(42,000)	(24,000)
Equity in income (losses)			(41,000)	(23,000)
Current assets	255,000		255,000		218,000
Property and equipment, net	95,772,000		95,772,000		92,846,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	(520,000)		(520,000)		(224,000)
Net assets	95,507,000		95,507,000		92,840,000
18-19 West LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			31,000	53,000
Net income (loss)			25,000	46,000
Partner's share of net (income)			12,000	23,000
Equity in income (losses)			13,000	23,000
Current assets	30,000		30,000		42,000
Property and equipment, net	4,449,000		4,449,000		4,412,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	0		0		(1,000)
Net assets	4,479,000		4,479,000		4,453,000
TRCC/Rock Outlet Center
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			0
Net income (loss)			(176,000)
Partner's share of net (income)			(88,000)
Equity in income (losses)			247,000
Current assets	9,381,000		9,381,000
Property and equipment, net	12,858,000		12,858,000
Other assets	0		0
Long-term debt	0		0
Other liabilities	(1,300,000)		(1,300,000)
Net assets	20,939,000		20,939,000
Centennial Founders, LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			314,000	135,000
Net income (loss)			(232,000)	(160,000)
Partner's share of net (income)			(66,000)	(50,000)
Equity in income (losses)			0	(110,000)
Current assets	142,000		142,000		491,000
Property and equipment, net	74,074,000		74,074,000		72,356,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	(1,024,000)		(1,024,000)		(1,099,000)
Net assets	$ 73,192,000		$ 73,192,000		$ 71,748,000