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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
CONSOLIDATED STATEMENTS OF INCOME    
Rental income from a lessee that qualifies as a related party$ 1,068$ 1,042$ 3,196$ 3,118
Straight-line rental income from a lessee that qualifies as a related party5783181259
Interest income from an entity that qualifies as a related party$ 180$ 180$ 540$ 540