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PRO FORMA FINANCIAL INFORMATION (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 $ / shares | Sep. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares | Sep. 30, 2016 $ / shares | Jun. 30, 2016 $ / shares | Mar. 31, 2016 $ / shares | Dec. 31, 2017 USD ($) property $ / shares | Dec. 31, 2016 USD ($) property $ / shares | Dec. 31, 2015 $ / shares
Consolidated results of operations on a pro forma basis |  |  |  |  |  |  |  |  |  |  |
Pro forma revenue | $ |  |  |  |  |  |  |  |  | $ 560,852 | $ 523,821 |
Pro forma income | $ |  |  |  |  |  |  |  |  | $ 145,941 | $ 115,269 |
Earnings per share from continuing operations: |  |  |  |  |  |  |  |  |  |  |
Basic - as reported (in dollars per share) | $ 0.22 | $ 0.21 | $ 0.18 | $ 0.14 | $ 0.13 | $ 0.13 | $ 0.11 | $ 0.08 | $ 0.74 | $ 0.45 | $ 0.43
Diluted - as reported (in dollars per share) | $ 0.22 | $ 0.21 | $ 0.18 | $ 0.14 | $ 0.13 | $ 0.13 | $ 0.11 | $ 0.08 | 0.74 | 0.45 | $ 0.42
Basic - as pro forma (in dollars per share) |  |  |  |  |  |  |  |  | 0.80 | 0.63 |
Diluted - as pro forma (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.80 | $ 0.62 |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | property |  |  |  |  |  |  |  |  | 7 | 28 |
Aggregate purchase price | $ |  |  |  |  |  |  |  |  | $ 80,700 | $ 403,600 |

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