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Acquisitions: Acquisitions: (Details 2) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oct. 24, 2013
Superstition Springs Land I
Oct. 03, 2012
FlatIron Crossing
Oct. 26, 2012
Arrowhead Towne Center
Acquisition            
Purchase price       $ 46,162 $ 310,397 $ 144,400
Less debt assumed (257,064) (420,123) (192,566) (22,500) (114,497) (75,375)
Prior gain deferral recognized         26,067  
Fair value of acquired net assets       $ 71,002 $ 287,442 $ 208,351