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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CONSOLIDATED STATEMENTS OF INCOME      
Rental income from a lessee that qualifies as a related party $ 4,479 $ 4,370 $ 4,264
Straight-line rental income from a lessee that qualifies as a related party 22 131 238
Interest income from an entity that qualifies as a related party   $ 235 $ 721