Investment in Unconsolidated and Consolidated Joint Ventures (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Net income (loss)	$ 2,292,000	$ 4,021,000	$ 4,991,000	$ 4,414,000
Current assets	95,443,000		95,443,000		90,753,000
Property and equipment, net	143,284,000		143,284,000		146,590,000
Long-term debt	(4,750,000)		(4,750,000)		(253,000)
Total
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			89,227,000	94,448,000
Net income (loss)			4,266,000	3,117,000
Partner's share of net (income)			1,681,000	1,219,000
Equity in income (losses)			2,920,000	1,648,000
Current assets	25,869,000		25,869,000		10,031,000
Property and equipment, net	176,559,000		176,559,000		160,479,000
Other assets	753,000		753,000		929,000
Long-term debt	(27,797,000)		(27,797,000)		(28,358,000)
Other liabilities	(4,349,000)		(4,349,000)		(3,614,000)
Net assets	171,035,000		171,035,000		139,467,000
Petro Travel Plaza Holdings LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			86,662,000	92,564,000
Net income (loss)			4,515,000	3,388,000
Partner's share of net (income)			1,806,000	1,355,000
Equity in income (losses)			2,709,000	1,783,000
Current assets	13,871,000		13,871,000		9,577,000
Property and equipment, net	43,776,000		43,776,000		44,196,000
Other assets	217,000		217,000		246,000
Long-term debt	(16,797,000)		(16,797,000)		(17,358,000)
Other liabilities	(2,855,000)		(2,855,000)		(3,350,000)
Net assets	38,212,000		38,212,000		33,311,000
Five West Parcel LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			2,518,000	1,818,000
Net income (loss)			102,000	(267,000)
Partner's share of net (income)			51,000	(134,000)
Equity in income (losses)			51,000	(133,000)
Current assets	2,000,000		2,000,000		194,000
Property and equipment, net	17,592,000		17,592,000		19,025,000
Other assets	536,000		536,000		683,000
Long-term debt	(11,000,000)		(11,000,000)		(11,000,000)
Other liabilities	(163,000)		(163,000)		(39,000)
Net assets	8,965,000		8,965,000		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)			(104,000)	(63,000)
Partner's share of net (income)			(52,000)	(32,000)
Equity in income (losses)			(52,000)	(31,000)
Current assets	2,293,000		2,293,000		218,000
Property and equipment, net	96,727,000		96,727,000		92,846,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	(483,000)		(483,000)		(224,000)
Net assets	98,537,000		98,537,000		92,840,000
18-19 West LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			47,000	66,000
Net income (loss)			42,000	59,000
Partner's share of net (income)			21,000	30,000
Equity in income (losses)			21,000	29,000
Current assets	35,000		35,000		42,000
Property and equipment, net	4,470,000		4,470,000		4,412,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	(10,000)		(10,000)		(1,000)
Net assets	4,495,000		4,495,000		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)			(289,000)
Partner's share of net (income)			(145,000)
Equity in income (losses)			191,000
Current assets	7,670,000		7,670,000
Property and equipment, net	13,994,000		13,994,000
Other assets	0		0
Long-term debt	0		0
Other liabilities	(838,000)		(838,000)
Net assets	20,826,000		20,826,000
Centennial Founders, LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			628,000	267,000
Net income (loss)			(196,000)	(388,000)
Partner's share of net (income)			(55,000)	(119,000)
Equity in income (losses)			0	(269,000)
Current assets	189,000		189,000		491,000
Property and equipment, net	74,668,000		74,668,000		72,356,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	(654,000)		(654,000)		(1,099,000)
Net assets	$ 74,203,000		$ 74,203,000		$ 71,748,000