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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Activity in Storage facilities    
Balance at beginning of year $ 3,998,180 $ 3,467,032
Acquisitions & improvements 247,546 490,980
Fully depreciated assets (53,903) (61,232)
Dispositions and other (9,179)  
Construction in progress (20,929) 101,400
Balance at end of year 4,161,715 3,998,180
Activity in Accumulated depreciation    
Balance at beginning of year 671,364 594,049
Depreciation expense 135,732 138,547
Fully depreciated assets (53,903) (61,232)
Dispositions and other (268)  
Balance at end of year 752,925 671,364
Real Estate Investment Property, Net $ 3,408,790 $ 3,326,816