Investment in Unconsolidated and Consolidated Joint Ventures (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Net income (loss)	$ 615,000	$ 275,000
Current assets	87,034,000		90,753,000
Property and equipment, net	151,781,000		146,590,000
Petro Travel Plaza Holdings LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues	26,474,000	27,873,000
Net income (loss)	650,000	(63,000)
Partner's share of net (income)	260,000	(25,000)
Equity in income (losses)	390,000	(252,000)
Current assets	9,828,000		9,577,000
Property and equipment, net	44,116,000		44,196,000
Other assets	236,000		246,000
Long-term debt	(17,173,000)		(17,358,000)
Other liabilities	(2,660,000)		(3,350,000)
Net assets	34,347,000		33,311,000
Five West Parcel LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues	846,000	199,000
Net income (loss)	55,000	(247,000)
Partner's share of net (income)	28,000	(124,000)
Equity in income (losses)	27,000	(123,000)
Current assets	877,000		194,000
Property and equipment, net	18,532,000		19,025,000
Other assets	722,000		683,000
Long-term debt	(11,000,000)		(11,000,000)
Other liabilities	(213,000)		(39,000)
Net assets	8,918,000		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)	(26,000)	(33,000)
Partner's share of net (income)	(13,000)	(16,000)
Equity in income (losses)	(13,000)	(17,000)
Current assets	453,000		218,000
Property and equipment, net	94,642,000		92,846,000
Other assets	0		0
Long-term debt	0		0
Other liabilities	(480,000)		(224,000)
Net assets	94,615,000		92,840,000
18-19 West LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues	14,000	71,000
Net income (loss)	10,000	66,000
Partner's share of net (income)	5,000	33,000
Equity in income (losses)	5,000	33,000
Current assets	46,000		42,000
Property and equipment, net	4,428,000		4,412,000
Other assets	0		0
Long-term debt	0		0
Other liabilities	(10,000)		(1,000)
Net assets	4,464,000		4,453,000
Total
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues	27,334,000	28,143,000
Net income (loss)	689,000	(277,000)
Partner's share of net (income)	280,000	(132,000)
Equity in income (losses)	409,000	(359,000)
Current assets	11,204,000		10,031,000
Property and equipment, net	161,718,000		160,479,000
Other assets	958,000		929,000
Long-term debt	(28,173,000)		(28,358,000)
Other liabilities	(3,363,000)		(3,614,000)
Net assets	142,344,000		139,467,000
Centennial Founders, LLC
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues	158,000	41,000
Net income (loss)	51,000	(134,000)
Partner's share of net (income)	15,000	(42,000)
Equity in income (losses)	0	0
Current assets	247,000		491,000
Property and equipment, net	73,028,000		72,356,000
Other assets	0		0
Long-term debt	0		0
Other liabilities	(901,000)		(1,099,000)
Net assets	$ 72,374,000		$ 71,748,000