Investment in Unconsolidated and Consolidated Joint Ventures (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Net income (loss)	$ 4,021,000	$ 2,558,000	$ 4,414,000	$ 10,656,000
Current assets	97,538,000		97,538,000		103,773,000
Property and equipment, net	140,086,000		140,086,000		128,430,000
Unconsolidated Properties [Member]
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			94,448,000	87,088,000
Net income (loss)			3,117,000	782,000
Partner's share of net (income)			1,219,000	199,000
Equity in income (losses)			1,648,000	583,000
Current assets	10,271,000		10,271,000		18,088,000
Property and equipment, net	159,612,000		159,612,000		149,983,000
Other assets	688,000		688,000		344,000
Long-term debt	(28,543,000)		(28,543,000)		(26,701,000)
Other liabilities	(4,549,000)		(4,549,000)		(3,971,000)
Net assets	137,479,000		137,479,000		137,743,000
Petro Travel Plaza Holdings [Member]
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			92,564,000	86,712,000
Net income (loss)			3,388,000	1,917,000
Partner's share of net (income)			1,355,000	767,000
Equity in income (losses)			1,783,000	1,150,000
Current assets	8,656,000		8,656,000		16,940,000
Property and equipment, net	44,125,000		44,125,000		44,092,000
Other assets	255,000		255,000		307,000
Long-term debt	(17,543,000)		(17,543,000)		(18,076,000)
Other liabilities	(3,651,000)		(3,651,000)		(2,648,000)
Net assets	31,842,000		31,842,000		40,615,000
18-19 West LLC [Member]
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			66,000	0
Net income (loss)			59,000	(79,000)
Partner's share of net (income)			30,000	(40,000)
Equity in income (losses)			29,000	(39,000)
Current assets	57,000		57,000		12,000
Property and equipment, net	4,420,000		4,420,000		4,255,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	(37,000)		(37,000)		0
Net assets	4,440,000		4,440,000		4,267,000
Five West Parcel [Member]
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			1,818,000	376,000
Net income (loss)			(267,000)	(1,016,000)
Partner's share of net (income)			(134,000)	(508,000)
Equity in income (losses)			(133,000)	(508,000)
Current assets	1,129,000		1,129,000		116,000
Property and equipment, net	19,495,000		19,495,000		16,509,000
Other assets	433,000		433,000		37,000
Long-term debt	(11,000,000)		(11,000,000)		(8,625,000)
Other liabilities	(221,000)		(221,000)		(201,000)
Net assets	9,836,000		9,836,000		7,836,000
Tejon Mountain Village [Member]
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			0	0
Net income (loss)			(63,000)	(40,000)
Partner's share of net (income)			(32,000)	(20,000)
Equity in income (losses)			(31,000)	(20,000)
Current assets	429,000		429,000		1,020,000
Property and equipment, net	91,572,000		91,572,000		85,127,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	(640,000)		(640,000)		(1,122,000)
Net assets	91,361,000		91,361,000		85,025,000
Centennial Founders, LLC [Member]
Condensed balance sheet information and statements of operations of unconsolidated and consolidated joint ventures
Gross revenues			267,000	216,000
Net income (loss)			(388,000)	(221,000)
Partner's share of net (income)			(119,000)	(77,000)
Equity in income (losses)			(269,000)	(144,000)
Current assets	263,000		263,000		325,000
Property and equipment, net	71,258,000		71,258,000		67,684,000
Other assets	0		0		0
Long-term debt	0		0		0
Other liabilities	(1,430,000)		(1,430,000)		(1,106,000)
Net assets	$ 70,091,000		$ 70,091,000		$ 66,903,000