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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
CONSOLIDATED STATEMENTS OF INCOME        
Rental income from a lessee that qualifies as a related party $ 1,122 $ 1,095 $ 2,235 $ 2,181
Straight-line rental income from a lessee that qualifies as a related party 3 31 16 70
Interest income from an entity that qualifies as a related party   $ 55   $ 235