v2.4.0.6
SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Carrying cost:      
Balance at beginning of period $ 17,029,404 $ 6,600,886 $ 6,292,621
Additions during period:      
Acquisitions 1,889,592 10,491,275 315,538
Capital expenditures 184,675 102,918 21,038
Dispositions:      
Sales and/or transfers to assets held for sale (349,456) (157,764) (46,083)
Foreign currency translation 9,688 (7,911) 17,772
Balance at end of period 18,763,903 17,029,404 6,600,886
Accumulated depreciation:      
Balance at beginning of period 1,729,976 1,368,219 1,177,911
Additions during period:      
Depreciation expense 620,076 380,734 197,256
Dispositions:      
Sales and/or transfers to assets held for sale (61,583) (16,536) (8,259)
Foreign currency translation 1,314 (2,441) 1,311
Balance at end of period $ 2,289,783 $ 1,729,976 $ 1,368,219