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CONSOLIDATED STATEMENTS OF CASH FLOWS (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 CASH FLOWS        
Straight-line rental income from a lessee that qualifies as a related party $ 3 $ 31 $ 16 $ 70