Annual report pursuant to Section 13 and 15(d)

Schedule III - Reconciliation (Details)

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Schedule III - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Self Storage properties:      
Balance at beginning of year $ 1,844,336 $ 1,147,201 $ 838,941
Acquisitions and improvements 431,542 715,509 308,323
Reclassifications from assets for sale 8,607 0 0
Write-off of fully depreciated assets and other (50) 0 (63)
Dispositions (7,336) (4,820) 0
Reclassification to assets held for sale (1,866) (13,554) 0
Balance at end of year 2,275,233 1,844,336 1,147,201
Accumulated depreciation:      
Balance at beginning of year 110,803 68,100 39,614
Depreciation expense 60,522 42,703 28,549
Write-off of fully depreciated assets and other (10) 0 (63)
Dispositions (646) 0 0
Assets held for sale (311) 0 0
Balance at end of year $ 170,358 $ 110,803 $ 68,100