Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator        
Net income $ 11,226 $ 7,944 $ 33,983 $ 18,791
Net income attributable to noncontrolling interests (9,955) (7,955) (29,790) (9,222)
Net income (loss) attributable to National Storage Affiliates Trust 1,271 (11) 4,193 9,569
Distributed and undistributed earnings allocated to participating securities (7) (4) (20) (13)
Net income (loss) attributable to common shareholders - basic 1,264 (15) 4,173 9,556
Effect of assumed conversion of dilutive securities 0 0 0 9,135
Net income (loss) attributable to common shareholders - diluted $ 1,264 $ (15) $ 4,173 $ 18,691
Denominator        
Weighted average shares outstanding - basic (in shares) 44,269 35,080 43,967 27,084
Effect of dilutive securities:        
Weighted average shares outstanding - diluted (in shares) 44,269 35,080 43,967 75,492
Earnings (loss) per share - basic (in dollars per share) $ 0.03 $ 0.00 $ 0.09 $ 0.35
Earnings (loss) per share - diluted (in dollars per share) $ 0.03 $ 0.00 $ 0.09 $ 0.25
OP units [Member] | NSA OP, LP [Member]        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 0 0 23,761
OP units [Member] | DownREIT Partnership [Member]        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 0 0 1,835
LTIP units [Member] | NSA OP, LP [Member]        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 0 0 2,162
Subordinated performance units [Member] | NSA OP, LP And DownREIT Partnership [Member]        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0 0 0 20,650