Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details)

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EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Net income $ 13,041 $ 15,576 $ 25,014 $ 22,757
Net income attributable to noncontrolling interests (7,150) (13,209) (8,663) (19,835)
Net income attributable to National Storage Affiliates Trust 5,891 2,367 16,351 2,922
Distributions to preferred shareholders (2,587) 0 (5,175) 0
Distributed and undistributed earnings allocated to participating securities (7) (7) (14) (13)
Net income attributable to common shareholders - basic 3,297 2,360 11,162 2,909
Effect of assumed conversion of dilutive securities 0 0 8,356 0
Net income attributable to common shareholders - diluted $ 3,297 $ 2,360 $ 19,518 $ 2,909
Denominator        
Weighted average shares outstanding - basic (in shares) 50,486 44,223 50,393 43,814
Effect of dilutive securities:        
Weighted average shares outstanding - diluted (in shares) 50,486 44,223 100,492 43,814
Earnings (loss) per share - basic (in dollars per share) $ 0.07 $ 0.05 $ 0.22 $ 0.07
Earnings (loss) per share - diluted (in dollars per share) $ 0.07 $ 0.05 $ 0.19 $ 0.07
OP units | NSA OP, LP        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 0 29,060 0
OP units | DownREIT Partnership        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 0 1,835 0
LTIP units | NSA OP, LP        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 0 323 0
Subordinated performance units | NSA OP, LP And DownREIT Partnership        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 0 18,881 0