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Pay vs Performance Disclosure
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
fFOPerShare
Dec. 31, 2022
USD ($)
fFOPerShare
Dec. 31, 2021
USD ($)
fFOPerShare
Dec. 31, 2020
USD ($)
fFOPerShare
Pay vs Performance Disclosure            
Pay vs Performance Disclosure, Table    
Year
Annual Total Compensation in Summary Compensation Table for PEO - Ms. Fischer(1)
Compensation Actually Paid to PEO - Ms. Fischer(1)(2)
Annual Total Compensation in Summary Compensation Table for PEO - Mr. Cramer(1)
Compensation Actually Paid to PEO - Mr. Cramer(1)(2)
Average Total Compensation in Summary Compensation Table for all other NEOs(3)
Average Compensation Actually Paid to all other NEOs(2)(3)
Value of Initial Fixed $100 Investment Based on: Net Income ($) (in thousands)Core FFO per Share ($)
TSR ($)
Peer Group TSR(4) ($)
2023$1,569,866 $1,983,647 $2,718,619 $4,481,248 $1,668,256 $2,447,252 $195 $144 $236,988 $2.69 
20224,072,342 (5,447,460)— —1,814,895 (1,979,905)121 101 183,765 2.81 
20213,175,600 11,759,386 ——1,485,9004,980,787221134146,9352.26
20202,779,857 4,565,285 ——1,344,2202,138,4741129579,4781.71
      
Company Selected Measure Name     Core FFO per share      
Named Executive Officers, Footnote    
(1)     Tamara D. Fischer served as our principal executive officer during 2020, 2021, 2022 and from January 1, 2023 to March 31, 2023. Mr. Cramer has served as our principal executive officer since April 1, 2023.
(3)    For each of 2020, 2021 and 2022, the NEOs included in this calculation are as follows: Mr. Nordhagen, Mr. Cramer and Mr. Togashi, and for 2023, the NEOs included in this calculation are as follows: Mr. Togashi, Mr. Cowan, and Ms. Kenyon (collectively, as applicable, the "Other NEOs"). 		     
Peer Group Issuers, Footnote    
(4)    The peer group utilized for the Peer Group TSR is the Nareit All Equity REIT Index.
      
Adjustment To PEO Compensation, Footnote    
2023
PEO - Ms. FischerPEO - Mr. Cramer
Other NEOs Average(3)
Annual Total Compensation for covered fiscal year in Summary Compensation Table$1,569,866 $2,718,619 $1,668,256 
Deduct grant date fair value of equity awards granted during the covered year-end(900,000)(1,700,000)(1,025,000)
Year-end fair value of awards granted in the covered year that were outstanding and unvested as of the covered year-end1,950,029 3,683,336 1,827,622 
Year-over-year change in fair value of awards granted in prior years that are outstanding and unvested as of the covered year-end(805,357)(303,255)(79,989)
Vesting date fair value of equity awards granted and vested in the covered year— — — 
Year-over-year change in fair value of equity awards granted in prior years that vested in the covered year— — 4,715 
Fair value as of prior-year end of equity awards granted in prior years that failed to vest in the covered year— — — 
Dollar value of dividends/earnings paid on equity awards in the covered year169,109 82,548 51,648 
Excess fair value for equity award modifications— — — 
Compensation Actually Paid$1,983,647 $4,481,248 $2,447,252 
      
Non-PEO NEO Average Total Compensation Amount     $ 1,668,256 $ 1,814,895 $ 1,485,900 $ 1,344,220
Non-PEO NEO Average Compensation Actually Paid Amount     $ 2,447,252 (1,979,905) 4,980,787 2,138,474
Adjustment to Non-PEO NEO Compensation Footnote    
2023
PEO - Ms. FischerPEO - Mr. Cramer
Other NEOs Average(3)
Annual Total Compensation for covered fiscal year in Summary Compensation Table$1,569,866 $2,718,619 $1,668,256 
Deduct grant date fair value of equity awards granted during the covered year-end(900,000)(1,700,000)(1,025,000)
Year-end fair value of awards granted in the covered year that were outstanding and unvested as of the covered year-end1,950,029 3,683,336 1,827,622 
Year-over-year change in fair value of awards granted in prior years that are outstanding and unvested as of the covered year-end(805,357)(303,255)(79,989)
Vesting date fair value of equity awards granted and vested in the covered year— — — 
Year-over-year change in fair value of equity awards granted in prior years that vested in the covered year— — 4,715 
Fair value as of prior-year end of equity awards granted in prior years that failed to vest in the covered year— — — 
Dollar value of dividends/earnings paid on equity awards in the covered year169,109 82,548 51,648 
Excess fair value for equity award modifications— — — 
Compensation Actually Paid$1,983,647 $4,481,248 $2,447,252 
      
Compensation Actually Paid vs. Total Shareholder Return    
2843
      
Compensation Actually Paid vs. Net Income    
2845
      
Compensation Actually Paid vs. Company Selected Measure    
2847
      
Total Shareholder Return Vs Peer Group    
2843
      
Tabular List, Table    
Set forth below is a list of the three most important financial performance measures used to link executive compensation actually paid to our NEOs during 2023 to Company performance.
•Core FFO per share
•Same Store NOI
•the Company's TSR as compared to the MSCI US REIT Index and as compared to the Public Company Self Storage REIT Peers or the Peer Group 3-Year Weighted Average TSR, as applicable. 		     
Total Shareholder Return Amount     $ 195 121 221 112
Peer Group Total Shareholder Return Amount     144 101 134 95
Net Income (Loss)     $ 236,988,000 $ 183,765,000 $ 146,935,000 $ 79,478,000
Company Selected Measure Amount | fFOPerShare     2.69 2.81 2.26 1.71
PEO Name Tamara D. Fischer Mr. Cramer   Tamara D. Fischer Tamara D. Fischer Tamara D. Fischer
Additional 402(v) Disclosure     Calculated for 2023 as set forth below. Fair value as referenced below is determined in accordance with ASC Topic 718 and for performance-based awards, reflects the maximum level of the LTIP grants and takes into account the probable outcome of the performance conditions as of the measurement date.
Set forth below are charts showing the following relationships for each of 2020, 2021, 2022 and 2023. For 2023, the compensation actually paid to our principal executive officer shown below consists of 25% of Ms. Fischer's 2023 compensation actually paid and 75% of Mr. Cramer's 2023 compensation actually paid, to reflect the change in our principal executive officer that occurred on April 1, 2023.
•The relationship between our principal executive officer and Other NEO compensation actually paid as compared to the Company's cumulative TSR and the Nareit All Equity REIT Index cumulative TSR, in each case as shown in the above table.
•The relationship between our principal executive officer and Other NEO compensation actually paid as compared to the Company's net income.
•The relationship between our principal executive officer and Other NEO compensation actually paid as compared to the Company's Core FFO per share.
      
Measure:: 1            
Pay vs Performance Disclosure            
Name     Core FFO per share      
Measure:: 2            
Pay vs Performance Disclosure            
Name     Same Store NOI      
Measure:: 3            
Pay vs Performance Disclosure            
Name     TSR      
Fischer [Member]            
Pay vs Performance Disclosure            
PEO Total Compensation Amount $ 1,569,866     $ 4,072,342 $ 3,175,600 $ 2,779,857
PEO Actually Paid Compensation Amount 1,983,647     $ (5,447,460) $ 11,759,386 $ 4,565,285
Cramer [Member]            
Pay vs Performance Disclosure            
PEO Total Compensation Amount   $ 2,718,619        
PEO Actually Paid Compensation Amount   4,481,248        
PEO | Fischer [Member] | NSA Equity Awards Reported Value Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount (900,000)          
PEO | Fischer [Member] | NSA Equity Awards Granted During The Year Unvested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 1,950,029          
PEO | Fischer [Member] | NSA Equity Awards Granted in Prior Years Unvested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount (805,357)          
PEO | Fischer [Member] | Equity Awards Granted During The Year Vested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Fischer [Member] | NSA Change in Fair Value of Equity Awards Granted in Prior Years that Vested in Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Fischer [Member] | NSA Fair Value as of Prior Year End of Equity Awards Granted in Prior Years that failed to Vest in Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Fischer [Member] | NSA Dollar Value of Dividends Earning Paid on Equity Awards in the Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 169,109          
PEO | Fischer [Member] | NSA Excess Fair Value For Equity Award Modifications [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount $ 0          
PEO | Cramer [Member] | NSA Equity Awards Reported Value Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount   (1,700,000)        
PEO | Cramer [Member] | NSA Equity Awards Granted During The Year Unvested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount   3,683,336        
PEO | Cramer [Member] | NSA Equity Awards Granted in Prior Years Unvested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount   (303,255)        
PEO | Cramer [Member] | Equity Awards Granted During The Year Vested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount   0        
PEO | Cramer [Member] | NSA Change in Fair Value of Equity Awards Granted in Prior Years that Vested in Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount   0        
PEO | Cramer [Member] | NSA Fair Value as of Prior Year End of Equity Awards Granted in Prior Years that failed to Vest in Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount   0        
PEO | Cramer [Member] | NSA Dollar Value of Dividends Earning Paid on Equity Awards in the Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount   82,548        
PEO | Cramer [Member] | NSA Excess Fair Value For Equity Award Modifications [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount   $ 0        
Non-PEO NEO | NSA Equity Awards Reported Value Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount     $ (1,025,000)      
Non-PEO NEO | NSA Equity Awards Granted During The Year Unvested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount     1,827,622      
Non-PEO NEO | NSA Equity Awards Granted in Prior Years Unvested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount     (79,989)      
Non-PEO NEO | Equity Awards Granted During The Year Vested Member [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount     0      
Non-PEO NEO | NSA Change in Fair Value of Equity Awards Granted in Prior Years that Vested in Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount     4,715      
Non-PEO NEO | NSA Fair Value as of Prior Year End of Equity Awards Granted in Prior Years that failed to Vest in Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount     0      
Non-PEO NEO | NSA Dollar Value of Dividends Earning Paid on Equity Awards in the Covered Year [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount     51,648      
Non-PEO NEO | NSA Excess Fair Value For Equity Award Modifications [Member]            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount     $ 0