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Related Party Transactions (Details) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Jan. 31, 1997
Robert Martin [Member]
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Dec. 31, 2011
RMC Entity [Member]
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Dec. 31, 2010
RMC Entity [Member]
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Dec. 31, 2009
RMC Entity [Member]
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Dec. 31, 2011
RMC Entities [Member]
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Dec. 31, 2010
RMC Entities [Member]
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Dec. 31, 2009
RMC Entities [Member]
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Dec. 31, 2011
Cali [Member]
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Dec. 31, 2010
Cali [Member]
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Dec. 31, 2009
Cali [Member]
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Dec. 31, 2011
Mack [Member]
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Dec. 31, 2010
Mack [Member]
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Dec. 31, 2009
Mack [Member]
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| Related Party Transaction [Line Items] | ||||||||||||||||
| Lease revenue | $ 600,163,000 | $ 602,357,000 | $ 611,061,000 | $ 130,000 | $ 137,000 | $ 140,000 | $ 69,000 | $ 68,000 | $ 68,000 | $ 253,000 | $ 250,000 | $ 255,000 | ||||
| Number of class properties acquired | 65 | |||||||||||||||
| Lease of property in square feet | 860,246 | 4,860 | 2,631 | 7,801 | ||||||||||||
| Lease expiration date | 2033 | December 2014 | ||||||||||||||
| Due from related parties | 0 | 0 | 92,000 | 75,000 | 15,000 | 17,000 | 0 | 0 | ||||||||
| Revenue under lease | 1,200,000 | 1,400,000 | 1,600,000 | |||||||||||||
| Reimbursement revenue | $ 97,000 | $ 101,000 | $ 115,000 | |||||||||||||