Revenues Revenues	12 Months Ended
Dec. 31, 2018
Revenue Recognition, Leases [Abstract]
Revenue Recognition, Leases [Policy Text Block]	3. Revenue On January 1, 2018, we adopted ASU 2014-09 and all related amendments in accordance with ASU 2014-09 and elected to apply the new revenue standard to those contracts which were not completed as of January 1, 2018. We also elected to omit disclosing the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which the invoiced amount directly corresponds to the value transferred to the customer as provided for in the practical expedients. Our adoption of ASU 2014-09 and its related amendments did not have a material impact upon our consolidated financial statements as the majority of our revenues are derived from real estate lease contracts which are scoped out of ASU 2014-09. Our presentation of revenue within our condensed consolidated statements of income and comprehensive income is separated into its component parts by the nature and timing of the revenue streams. Our revenue within the scope of this new revenue standard is recognized when the services are transferred to our customers for an amount which reflects the consideration we expect to receive in exchange for those services rendered and include the following: Other Property Revenues. The items within other property revenues relate to non-lease components within a lease contract and primarily consist of utility rebillings which are usually recognized over time and other transactional fees primarily recognized at a point-in-time. These fees are charged to our residents and recognized monthly as the performance obligation is satisfied. Upon our adoption of ASU 2014-09, we are now presenting certain revenue items, historically included as a component of other property revenues, as rental revenues due to the nature and timing of revenue recognition for these items being more closely aligned to a lease. This new presentation has been applied prospectively as this reclassification will not have an impact upon total property revenues or the opening balance of retained earnings. Approximately $22.2 million of rental revenue is related to this presentation for the year ended December 31, 2018. Had ASU 2014-09 been effective as of January 1, 2017, we would have reclassified approximately $21.9 million from other property revenues to rental revenue for the year ended December 31, 2017. Fee and Asset Management Income. Management fee income primarily consists of fees charged to our unconsolidated joint ventures for managing the joint venture, and the development, redevelopment and capital expenditures of their operating communities. While the individual activities related to these fees may vary, the services provided are substantially similar, have the same pattern of transfer, and are considered to be individual performance obligations composed of a series of distinct services, recognized monthly as earned. We also generate construction fees for construction management and general contracting services provided to third-party owners of multifamily, commercial, and retail properties. These fees are recognized as we satisfy our single performance obligation over time based on a percentage-of-completion of cost basis which we believe is an accurate depiction of the transfer of control to our customers. For these contracts, significant judgment is used to estimate the cost plus margin for the project fee and our profitability on those contracts is dependent on the ability to accurately predict such factors. Contract Balances. We record third-party construction receivables for amounts where we have unconditional rights to payment but have not received and liabilities for amounts incurred but not paid. For the years ended December 31, 2018 and 2017, these contract receivable and liability balances were immaterial.

3. Revenue

On January 1, 2018, we adopted ASU 2014-09 and all related amendments in accordance with ASU 2014-09 and elected to apply the new revenue standard to those contracts which were not completed as of January 1, 2018. We also elected to omit disclosing the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which the invoiced amount directly corresponds to the value transferred to the customer as provided for in the practical expedients. Our adoption of ASU 2014-09 and its related amendments did not have a material impact upon our consolidated financial statements as the majority of our revenues are derived from real estate lease contracts which are scoped out of ASU 2014-09.

Our presentation of revenue within our condensed consolidated statements of income and comprehensive income is separated into its component parts by the nature and timing of the revenue streams. Our revenue within the scope of this new revenue standard is recognized when the services are transferred to our customers for an amount which reflects the consideration we expect to receive in exchange for those services rendered and include the following:

Other Property Revenues. The items within other property revenues relate to non-lease components within a lease contract and primarily consist of utility rebillings which are usually recognized over time and other transactional fees primarily recognized at a point-in-time. These fees are charged to our residents and recognized monthly as the performance obligation is satisfied.

Upon our adoption of ASU 2014-09, we are now presenting certain revenue items, historically included as a component of other property revenues, as rental revenues due to the nature and timing of revenue recognition for these items being more closely aligned to a lease. This new presentation has been applied prospectively as this reclassification will not have an impact upon total property revenues or the opening balance of retained earnings. Approximately $22.2 million of rental revenue is related to this presentation for the year ended December 31, 2018. Had ASU 2014-09 been effective as of January 1, 2017, we would have reclassified approximately $21.9 million from other property revenues to rental revenue for the year ended December 31, 2017.

Fee and Asset Management Income. Management fee income primarily consists of fees charged to our unconsolidated joint ventures for managing the joint venture, and the development, redevelopment and capital expenditures of their operating communities. While the individual activities related to these fees may vary, the services provided are substantially similar, have the same pattern of transfer, and are considered to be individual performance obligations composed of a series of distinct services, recognized monthly as earned.

We also generate construction fees for construction management and general contracting services provided to third-party owners of multifamily, commercial, and retail properties. These fees are recognized as we satisfy our single performance obligation over time based on a percentage-of-completion of cost basis which we believe is an accurate depiction of the transfer of control to our customers. For these contracts, significant judgment is used to estimate the cost plus margin for the project fee and our profitability on those contracts is dependent on the ability to accurately predict such factors.

Contract Balances. We record third-party construction receivables for amounts where we have unconditional rights to payment but have not received and liabilities for amounts incurred but not paid. For the years ended December 31, 2018 and 2017, these contract receivable and liability balances were immaterial.