Revenue Recognition (Notes)	3 Months Ended
Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Revenue Recognition	REVENUE RECOGNITION Rental revenues are recognized as earned based upon amounts that are currently due from tenants. Leases are generally on month-to-month terms. Prepaid rents are recognized on a straight-line basis over the term of the leases. Promotional discounts are recognized as a reduction to rental income over the promotional period. Late charges, administrative fees, merchandise sales and truck rentals are recognized as income when earned. Tenant reinsurance premiums are recognized as revenue over the period of insurance coverage. The Company's management fees are earned subject to the terms of the related management services agreements ("MSAs"). These MSAs provide that the Company will perform management services, which include leasing and operating the property and providing accounting, marketing, banking and maintenance services. These services are provided in exchange for monthly management fees, which are based on a percentage of revenues collected from stores owned by third parties and unconsolidated joint ventures. MSAs generally have original terms from three to five years, after which management services are provided on a month-to-month basis unless terminated. Management fees are due on the last day of each calendar month that management services are provided. The Company accounts for the management services provided to a customer as a single performance obligation which are rendered over time each month. The total amount of consideration from the contract is variable as it is based on monthly revenues each month. The variable amount of management fees earned is dependent on the revenue and cash collected at the managed stores. Revenue is influenced by multiple factors, including tenant behavior, economic conditions in the markets in which the stores are located, the effect of competition, and other factors outside of the Company's control. Since the management fee is dependent on revenue levels, the MSAs have a large number and broad range of possible consideration amounts that are difficult to estimate. The total consideration for each contract cannot be estimated as it is dependent on factors outside of the Company's control. The uncertainty about the amount of consideration to be received under each MSA cannot be resolved until the actual revenues and cash collected by the related managed stores is known. The total consideration for each MSA is not known until the end of that MSA's term. One month of uncertainty regarding the consideration amount is resolved as each month passes and the actual revenues for that month can be determined. Therefore, at the end of each month, the Company allocates the actual management fee earned to the distinct services provided during that month and recognizes it as revenue as the uncertainty regarding the amount of revenues for that month has been resolved. Due to the standardized terms of the MSAs, the Company accounts for all MSAs in a similar, consistent manner. Therefore, no disaggregated information relating to MSAs is presented.

REVENUE RECOGNITION

Rental revenues are recognized as earned based upon amounts that are currently due from tenants. Leases are generally on month-to-month terms. Prepaid rents are recognized on a straight-line basis over the term of the leases. Promotional discounts

are recognized as a reduction to rental income over the promotional period. Late charges, administrative fees, merchandise sales

and truck rentals are recognized as income when earned. Tenant reinsurance premiums are recognized as revenue over the period of insurance coverage.

The Company's management fees are earned subject to the terms of the related management services agreements ("MSAs"). These MSAs provide that the Company will perform management services, which include leasing and operating the property and providing accounting, marketing, banking and maintenance services. These services are provided in exchange for monthly management fees, which are based on a percentage of revenues collected from stores owned by third parties and unconsolidated joint ventures. MSAs generally have original terms from three to five years, after which management services are provided on a month-to-month basis unless terminated. Management fees are due on the last day of each calendar month that management services are provided.

The Company accounts for the management services provided to a customer as a single performance obligation which are rendered over time each month. The total amount of consideration from the contract is variable as it is based on monthly revenues each month. The variable amount of management fees earned is dependent on the revenue and cash collected at the managed stores. Revenue is influenced by multiple factors, including tenant behavior, economic conditions in the markets in which the stores are located, the effect of competition, and other factors outside of the Company's control. Since the management fee is dependent on revenue levels, the MSAs have a large number and broad range of possible consideration amounts that are difficult to estimate.

The total consideration for each contract cannot be estimated as it is dependent on factors outside of the Company's control. The uncertainty about the amount of consideration to be received under each MSA cannot be resolved until the actual revenues and cash collected by the related managed stores is known. The total consideration for each MSA is not known until the end of that MSA's term. One month of uncertainty regarding the consideration amount is resolved as each month passes and the actual revenues for that month can be determined. Therefore, at the end of each month, the Company allocates the actual management fee earned to the distinct services provided during that month and recognizes it as revenue as the uncertainty regarding the amount of revenues for that month has been resolved.

Due to the standardized terms of the MSAs, the Company accounts for all MSAs in a similar, consistent manner. Therefore, no disaggregated information relating to MSAs is presented.