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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Subsequent to year end, the Company acquired its joint venture partner's interests in Extra Space West One LLC and Extra Space West Two LLC. The 12 stores owned by these joint ventures are now wholly-owned by the Company. The Company paid cash of $172,515 and assumed an existing loan of $17,157.