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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME      
Rental income from a lessee that qualifies as a related party $ 4,264 $ 4,160 $ 4,058
Straight-line rental income from a lessee that qualifies as a related party 238 342 443
Interest income from an entity that qualifies as a related party $ 721 $ 720 $ 720