Investment in Unconsolidated and Consolidated Joint Ventures - Condensed Statements of Operations and Balance Sheet Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Operations
Equity in earnings (losses)	$ 2,535,000	$ 916,000	$ 541,000
Balance Sheet Information
Current assets	90,753,000	103,773,000
Property and equipment, net	146,590,000	128,430,000
Unconsolidated Properties [Member]
Statement of Operations
Revenues	124,454,000	116,170,000
Net income (loss)	4,604,000	1,226,000
Partner’s share of net income (loss)	1,816,000	303,000
Equity in earnings (losses)	2,535,000	916,000
Balance Sheet Information
Current assets	10,031,000	18,088,000
Property and equipment, net	160,479,000	149,983,000
Other assets	929,000	344,000
Long-term debt	(28,358,000)	(26,701,000)
Other liabilities	(3,614,000)	(3,971,000)
Net assets	139,467,000	137,743,000
Petro Travel Plaza Holdings [Member]
Statement of Operations
Revenues	121,664,000	115,992,000
Net income (loss)	4,857,000	3,104,000
Partner’s share of net income (loss)	1,943,000	1,242,000
Equity in earnings (losses)	2,661,000	1,862,000
Balance Sheet Information
Current assets	9,577,000	16,940,000
Property and equipment, net	44,196,000	44,092,000
Other assets	246,000	307,000
Long-term debt	(17,358,000)	(18,076,000)
Other liabilities	(3,350,000)	(2,648,000)
Net assets	33,311,000	40,615,000
Five West Parcel [Member]
Statement of Operations
Revenues	2,710,000	178,000
Net income (loss)	(241,000)	(1,834,000)
Partner’s share of net income (loss)	(121,000)	(917,000)
Equity in earnings (losses)	(120,000)	(917,000)
Balance Sheet Information
Current assets	194,000	116,000
Property and equipment, net	19,025,000	16,509,000
Other assets	683,000	37,000
Long-term debt	(11,000,000)	(8,625,000)
Other liabilities	(39,000)	(201,000)
Net assets	8,863,000	7,836,000
Tejon Mountain Village [Member]
Statement of Operations
Revenues	0	0
Net income (loss)	(84,000)	(38,000)
Partner’s share of net income (loss)	(42,000)	(19,000)
Equity in earnings (losses)	(42,000)	(26,000)
Balance Sheet Information
Current assets	218,000	1,020,000
Property and equipment, net	92,846,000	85,127,000
Other assets	0	0
Long-term debt	0	0
Other liabilities	(224,000)	(1,122,000)
Net assets	92,840,000	85,025,000
18-19 West LLC [Member]
Statement of Operations
Revenues	80,000	0
Net income (loss)	72,000	(6,000)
Partner’s share of net income (loss)	36,000	(3,000)
Equity in earnings (losses)	36,000	(3,000)
Balance Sheet Information
Current assets	42,000	12,000
Property and equipment, net	4,412,000	4,255,000
Other assets		0
Long-term debt	0	0
Other liabilities	(1,000)	0
Net assets	4,453,000	4,267,000
Centennial Founders, LLC [Member]
Statement of Operations
Revenues	582,000	380,000
Net income (loss)	(530,000)	(336,000)
Partner’s share of net income (loss)	(158,000)	(113,000)
Equity in earnings (losses)	0	0
Balance Sheet Information
Current assets	491,000	325,000
Property and equipment, net	72,356,000	67,684,000
Other assets	0	0
Long-term debt	0	0
Other liabilities	(1,099,000)	(1,106,000)
Net assets	$ 71,748,000	$ 66,903,000