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Summary of Significant Accounting Policies
12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Summary of Significant Accounting Policies Summary of Significant Accounting Policies
 
Basis of Presentation
 
The accompanying consolidated financial statements, presented in U.S. dollars, are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities as of the date of the financial statements, and revenue and expenses during the reporting periods. The Company’s actual results could differ from those estimates and assumptions. All material intercompany transactions among consolidated entities have been eliminated. All dollar amounts in the tables herein, except share, per share, unit and per unit amounts, are stated in thousands unless otherwise indicated.

Principles of Consolidation

The Company’s consolidated financial statements include its accounts and the accounts of other subsidiaries and joint ventures (including partnerships and limited liability companies) over which it has control. Investments acquired or created are evaluated based on the accounting guidance relating to variable interest entities (“VIEs”), which requires the consolidation of VIEs in which the Company is considered to be the primary beneficiary. If the investment is determined not to be a VIE, then the investment is evaluated for consolidation using the voting interest model.

Recently Issued Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Company on January 1, 2020. In November 2018, the FASB issued ASU 2018-19, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, which amends the transition requirements and scope of ASU 2016-13 and clarifies that receivables arising from operating leases are not within the scope of the credit losses standard, but rather, should be accounted for in accordance with the leases standard.

The Company notes that a majority of its financial instruments result from operating leasing transactions, which as mentioned above, are not within the scope of the new standard. However, the Company did perform both a quantitative and qualitative analysis on the financial assets that are covered under this guidance, including its loans receivable. Based on this analysis, which included analyzing historical performance, occupancy rates, projected future performance, and macroeconomic trends, the Company concluded this new standard would not have a material impact on the consolidated financial statements.
In addition, the Company does not expect the following accounting pronouncements issued by the FASB to have a material effect on its consolidated financial statements:

Accounting Standards Update
 
Effective Date
 
 
 
ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract”
 
January 1, 2020
ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement”
 
January 1, 2020
ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes"
 
January 1, 2021

Recently Adopted Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02 (“ASU 2016-12”), “Leases (Topic 842): Amendments to the FASB Accounting Standards Codification.” ASU 2016-02 outlines principles for the recognition, measurement, presentation and disclosure of leases.  Subsequent to the issuance of ASU 2016-02, the FASB issued additional ASUs clarifying aspects of the new lease accounting standard, which were effective upon adoption of ASU 2016-02. These lease-related ASUs are collectively referred to as the “New Leases Standard.”

The Company adopted the New Leases Standard on January 1, 2019, utilizing the modified retrospective transition approach. Under this approach, the Company elected to apply the new standard to leases that were in place as of January 1, 2019. Effective January 1, 2019, when the Company enters into a contract or amends an existing contract, it evaluates whether the contract meets the definition of a lease under the New Leases Standard. To meet the definition of a lease the contract must meet all three of the following criteria:

One party (lessor) must hold an identified asset;
The counterparty (lessee) must have the right to obtain substantially all of the economic benefits from the use of the asset throughout the period of the contract; and
The counterparty (lessee) must have the right to direct the use of the identified asset throughout the period of the contract

Results for reporting periods beginning January 1, 2019 are presented under the New Leases Standard.  Upon adoption, the Company did not record an adjustment to beginning retained earnings. In addition, the Company adopted the following additional practical expedients available for implementation:

An entity need not reassess whether any existing or expired contracts are or contain leases;
An entity need not reassess lease classification for any existing or expired leases; and
An entity need not reassess initial direct costs for any existing leases.

As Lessee:

Under the New Leases Standard, lessees classify leases as either operating or finance leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification determines whether lease expense is recognized on a straight-line basis over the term of the lease (operating lease) or under the effective interest method (finance lease). In addition, the New Leases Standard requires lessees to recognize right-of-use assets and related lease liabilities for leases with a term greater than 12 months regardless of their lease classification. The New Leases Standard does provide a practical expedient that allows lessees to not apply the recognition requirements discussed above to leases with a lease term of 12 months or less. The Company elected to adopt this practical expedient available for implementation.
Upon adoption of the New Leases Standard on January 1, 2019, the Company was a lessee under 28 ground leases and two corporate office headquarters leases for which it recorded $278.2 million in right of use assets (“ROU Assets”), and $277.5 million of operating lease liabilities. 
Because the Company’s existing leases under which it is a lessee will continue to be classified as operating leases, the timing and pattern of lease expense recognition (straight-line basis) will remain unchanged. Leases entered into or modified after January 1, 2019, were evaluated under the New Leases Standard and were also classified as operating leases.

As Lessor:

Under the New Leases Standard, the accounting for lessors remained largely unchanged from current GAAP; however, ASU 2016-02 required that lessors expense, on an as-incurred basis, certain initial direct costs that are not incremental in negotiating a lease. Under the prior standard, these costs were capitalizable and therefore the New Leases Standard resulted in certain of these costs being expensed as incurred after adoption. For the Company, these costs include internal leasing payroll costs incurred for owned and presale development projects, as well as certain legal expenses incurred when negotiating commercial leases. 
The New Leases Standard also requires lessors to evaluate collectability of all operating lease payments in a contract at lease commencement and thereafter. The Company concludes that operating lease payments are probable of collection at lease commencement. If the operating lease payments are subsequently deemed not probable of collection, adjustments are recognized as a reduction to lease income and, subsequently, any lease revenue is only recognized when cash receipts are received. This resulted in the reclassification of the provision for uncollectible accounts from operating expenses to revenue.  This adjustment is reflected on a prospective basis in the accompanying consolidated statements of comprehensive income, starting on January 1, 2019.  The provision for uncollectible accounts for owned properties was $7.3 million, $7.1 million and $6.4 million for the year ended December 31, 20192018 and 2017, respectively. The provision for uncollectible accounts for on-campus participating properties was a $0.5 million benefit for the year ended December 31, 2019, and a $0.3 million expense for both year ended December 31, 2018 and 2017.
The New Leases Standard allows lessors to maintain an allowance for uncollectible operating lease receivables. If after lease commencement, the assessment of collectability on operating lease payments changes, a lessor can determine whether the allowance adequately contemplated this change. Upon adoption, the Company elected to maintain its allowance for operating leases and concluded the allowance adequately contemplated operating lease payments that were deemed not probable of collection for the year ended December 31, 2019.
The New Leases Standard provides a practical expedient that allows lessors to not separate certain lease and non-lease components if certain criteria are met. The Company assessed the criteria and determined that the timing and pattern of transfer for common area maintenance and the related rental revenue is the same. Therefore, the Company elected the practical expedient which resulted in no change to how revenue is currently recorded.

In addition, on January 1, 2019, the Company adopted the following accounting pronouncements which did not have a material effect on the Company’s consolidated financial statements:

ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”
ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities”
ASU 2018-16, "Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes"

Use of Estimates
 
The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period.  Actual results could differ from those estimates.
 
Investments in Real Estate
 
Investments in real estate are recorded at historical cost.  Major improvements that extend the life of an asset are capitalized and depreciated over the remaining useful life of the asset.  The cost of ordinary repairs and maintenance are expensed as incurred.  Depreciation and amortization are recorded on a straight-line basis over the estimated useful lives of the assets as follows:
Buildings and improvements
 
7-40 years
Leasehold interest - on-campus participating properties
 
25-34 years (shorter of useful life or respective lease term)
Furniture, fixtures and equipment
 
3-7 years

 
Project costs directly associated with the development and construction of an owned real estate project, which include interest, property taxes, and amortization of deferred financing costs, are capitalized as construction in progress.  Upon completion of the project, costs are transferred into the applicable asset category and depreciation commences.  Interest totaling approximately $12.1 million, $11.7 million and $15.9 million was capitalized during the years ended December 31, 2019, 2018, and 2017, respectively.  
 
Management assesses whether there has been an impairment in the value of the Company’s investments in real estate whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.  Impairment is recognized when estimated expected future undiscounted cash flows are less than the carrying value of the property, or when a property meets the criteria to be classified as held for sale, at which time an impairment charge is recognized for any excess of the carrying value of the property over the expected net proceeds from the disposal.  The estimation of expected future net cash flows uses estimates, including capitalization rates and growth rates, which are inherently uncertain and rely on assumptions regarding current and future economics and market conditions.  If such conditions change, then an adjustment to the carrying value of the Company’s long-lived assets could occur in the future period in which the conditions change.  To the extent that a property is impaired, the excess of the carrying amount of the property over its estimated fair value is charged to earnings. In the case of any impairment, the valuation would be based on Level 3 inputs. During the year ended December 31, 2019, concurrent with the classification of one owned property as held for sale, the Company recorded a $3.2 million impairment charge which is included in provision for impairment within operating income on the Consolidated Statements of Comprehensive Income. There were no impairment charges during the year ended December 31, 2018. The Company recorded a $15.3 million impairment charge in June 2017 for one property that was in receivership and was returned to the lender during the year ended December 31, 2019. Refer to Note 6 for additional information regarding the disposition and to Note 9 for additional information regarding the property returned to the lender.

The Company evaluates each acquisition to determine if the integrated set of assets and activities acquired meet the definition of a business. If either of the following criteria is met, the integrated set of assets and activities acquired would not qualify as a business:

Substantially all of the fair value of the gross assets acquired is concentrated in either a single identifiable asset or a group of similar identifiable assets; or
The integrated set of assets and activities is lacking, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs (i.e. revenue generated before and after the transaction).

Property acquisitions deemed to qualify as a business are accounted for as business combinations, and the related acquisition costs are expensed as incurred. The Company allocates the purchase price of properties acquired in business combinations to net tangible and identified intangible assets based on their fair values.  Fair value estimates are based on information obtained from a number of sources, including independent appraisals that may be obtained in connection with the acquisition or financing of the respective property, the Company’s own analysis of recently acquired and existing comparable properties in the Company’s portfolio, and other market data.  Information obtained about each property as a result of due diligence, marketing, and leasing activities is also considered.  The value allocated to land is generally based on the actual purchase price if acquired separately, or market research/comparables if acquired as part of an existing operating property.  The value allocated to building is based on the fair value determined on an “as-if vacant” basis, which is estimated using a replacement cost approach that relies upon assumptions that the Company believes are consistent with current market conditions for similar properties. The value allocated to furniture, fixtures, and equipment is based on an estimate of the fair value of the appliances and fixtures inside the units. The Company has determined these estimates are primarily based upon unobservable inputs and therefore are considered to be Level 3 inputs within the fair value hierarchy.

Acquisitions of properties that do not meet the definition of a business are accounted for as asset acquisitions.  The accounting model for asset acquisitions is similar to the accounting model for business combinations except that the acquisition consideration (including transaction costs) is allocated to the individual assets acquired and liabilities assumed on a relative fair value basis.  The relative fair values used to allocate the cost of an asset acquisition are determined using the same methodologies and assumptions as those utilized to determine fair value in a business combination.

Long-Lived Assets–Held for Sale
 
Long-lived assets to be disposed of are classified as held for sale in the period in which all of the following criteria are met:

a.
Management, having the authority to approve the action, commits to a plan to sell the asset.

b.
The asset is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such assets.

c.
An active program to locate a buyer and other actions required to complete the plan to sell the asset have been initiated.

d.
The sale of the asset is probable, and transfer of the asset is expected to qualify for recognition as a completed sale, within one year.

e.
The asset is being actively marketed for sale at a price that is reasonable in relation to its current fair value.

f.
Actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn.
  
Concurrent with this classification, the asset is recorded at the lower of cost or fair value less estimated selling costs, and depreciation ceases. The Company did not have any properties classified as held for sale as of December 31, 2019 and 2018.

Cash and Cash Equivalents
 
The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.  The Company maintains cash balances in various banks.  At times, the Company’s balances may exceed the amount insured by the FDIC.  As the Company only uses money-centered financial institutions, the Company does not believe it is exposed to any significant credit risk related to its cash and cash equivalents.

Restricted Cash
 
Restricted cash consists of funds held in trusts that were established in connection with three bond issues for the Company’s on-campus participating properties. The funds are invested in low risk investments, generally consisting of government backed securities, as permitted by the indentures of trusts.  Additionally, restricted cash includes escrow accounts held by lenders and resident security deposits, as required by law in certain states.  Restricted cash also consists of escrow deposits made in connection with potential property acquisitions and development opportunities.  These escrow deposits are invested in interest-bearing accounts at federally-insured banks.  Realized and unrealized gains and losses are not material for the periods presented.

Loans Receivable
 
Loans held for investment are intended to be held to maturity and, accordingly, are carried at cost, net of unamortized loan purchase discounts, and net of an allowance for loan losses when such loan is deemed to be impaired.  Loan purchase discounts are amortized over the term of the loan.  The unamortized discount on the loans receivable was $2.3 million and $2.4 million as of December 31, 2019 and 2018, respectively. The Company considers a loan impaired when, based upon current information and events, it is probable that it will be unable to collect all amounts due for both principal and interest according to the contractual terms of the loan agreement.  Management’s estimate of the collectability of principal and interest payments under the Company’s loans receivable from CaPFA Capital Corp. 2000F (“CaPFA”), which mature in December 2040 and carry a balance, net of discount, of approximately $50.6 million and $54.6 million as of December 31, 2019 and 2018, respectively, are highly dependent on the future operating performance of the properties securing the loans.  As future economic conditions and/or market conditions at the properties change, management will continue to evaluate the collectability of such amounts. There were no impairments of the carrying value of its loans receivable as of December 31, 2019. Loans receivable are included in Other Assets on the accompanying Consolidated Balance Sheets.

Intangible Assets
 
A portion of the purchase price of acquired properties is allocated to the value of in-place leases for both student and commercial tenants, which is based on the difference between (i) the property valued with existing in-place leases adjusted to market rental rates and (ii) the property valued “as-if” vacant.  As lease terms for student leases are typically one year or less, rates on in-place leases generally approximate market rental rates.  Factors considered in the valuation of in-place leases include an estimate of the carrying costs during the expected lease-up period considering current market conditions, nature of the tenancy, and costs to execute similar leases.  Carrying costs include estimates of lost rents at market rates during the expected lease-up period as well as marketing and other operating expenses.  The value of in-place leases is amortized over the remaining initial term of the respective leases.  The purchase price of property acquisitions is not allocated to student tenant relationships, considering the terms of the leases and the expected levels of renewals.

For acquired properties subject to an in-place property tax incentive arrangement, a portion of the purchase price is allocated to the present value of expected future property tax savings over the projected incentive arrangement period. There were no new acquisitions or investments in joint ventures during the years ended December 31, 2019 and 2018, that required an allocation to in-place property tax incentive arrangements assumed. Unamortized in-place property tax incentive arrangements as of December 31, 2019 and 2018 were approximately $38.6 million and $56.3 million, respectively, and are included in other assets on the accompanying consolidated balance sheets. Amortization expense was approximately $3.5 million, $3.7 million, and $3.3 million for the years ended December 31, 2019, 2018, and 2017, respectively, and is included in owned properties operating expense in the accompanying consolidated statements of comprehensive income. As of December 31, 2019, the remaining weighted average tax incentive arrangement period was 18.0 years. During the year ended December 31, 2019, the Company recorded a $14.0 million impairment charge associated with a tax incentive arrangement that was recorded upon acquisition of an owned property in 2015 due to current facts and circumstances indicating that the originally assumed property tax savings will not materialize. This impairment charge is based on Level 3 inputs and is included in provision for impairment on the accompanying Consolidated Statements of Comprehensive Income.

Deferred Financing Costs

The Company defers financing costs and amortizes the costs over the terms of the related debt using the effective-interest method.  Upon repayment of or in conjunction with a material change in the terms of the underlying debt agreement, any unamortized costs are charged to earnings. In those instances when debt modifications do not include material changes to the terms of the underlying debt agreement, unamortized costs of the original instrument are added to the costs of the modification and amortized over the life of the modified debt using the effective interest method.  Deferred financing costs, net of amortization, for the Company’s revolving credit facility are included in other assets on the accompanying consolidated balance sheets. Net deferred financing costs for the Company’s revolving credit facility were approximately $3.5 million as of both December 31, 2019, and 2018.

Redeemable Noncontrolling Interests

The Company follows guidance issued by the FASB regarding the classification and measurement of redeemable securities. Under this guidance, securities that are redeemable for cash or other assets, at the option of the holder and not solely within the control of the issuer, must be classified outside of permanent equity as redeemable noncontrolling interests. The Company makes this determination based on terms in the applicable agreements, specifically in relation to redemption provisions. The Company initially records the redeemable noncontrolling interests at fair value. The carrying amount of the redeemable noncontrolling interest is subsequently adjusted to the redemption value (assuming the noncontrolling interest is redeemable at the balance sheet date), with the corresponding offset for changes in fair value recorded in additional paid in capital. Reductions in fair value are recorded only to the extent that the Company has previously recorded increases in fair value above the redeemable noncontrolling interests’ initial basis. As the changes in redemption value are based on fair value, there is no effect on the Company’s earnings per share. Redeemable noncontrolling interests on the accompanying consolidated balance sheets of ACC are referred to as redeemable limited partners on the consolidated balance sheets of the Operating Partnership. Refer to Note 8 for a more detailed discussion of redeemable noncontrolling interests for both ACC and the Operating Partnership.

Consolidated VIEs

The Company has investments in various entities that qualify as VIEs for accounting purposes and for which the Company is the primary beneficiary and therefore includes the entities in its consolidated financial statements. These VIEs include the Operating Partnership, six joint ventures that own a total of 11 operating properties and a land parcel, and six properties owned under the on-campus participating property structure. The VIE assets and liabilities consolidated within the Company's assets and liabilities are disclosed at the bottom of the Consolidated Balance Sheets.

Joint Ventures
 
The Company consolidates joint ventures when it exhibits financial or operational control, which is determined using accounting standards related to the consolidation of joint ventures and VIEs.  For joint ventures that are defined as VIEs, the primary beneficiary consolidates the entity.  The Company considers itself to be the primary beneficiary of a VIE when it has the power to direct the activities that most significantly impact the performance of the VIE, such as management of day-to-day operations, preparing and approving operating and capital budgets, and encumbering or selling the related properties.  In instances where the Company is not the primary beneficiary, it does not consolidate the joint venture for financial reporting purposes.

For joint ventures that are not defined as VIEs, where the Company is the general partner, but does not control the joint venture as the other partners hold substantive participating rights, the Company uses the equity method of accounting.  For joint ventures where the Company is a limited partner, management evaluates whether the Company holds substantive participating rights. In instances where the Company holds substantive participating rights in the joint venture, the Company consolidates the joint venture; otherwise, it uses the equity method of accounting.

Presale Development Projects

As part of its development strategy, the Company enters into presale agreements to purchase various properties. Under the terms of these agreements, the Company is obligated to purchase the property as long as certain construction completion deadlines and other closing conditions are met. As a part of the presale agreements, the Company has the option to elect not to purchase the asset, which would result in the Company paying a significant penalty. The Company is typically responsible for leasing, management, and initial operations of the project while the third-party developer retains development risk during the construction period. The entity that owns the property is deemed to be a VIE, and the Company is deemed to be the primary beneficiary of the VIE. As such, upon execution of the purchase and sale agreement, the Company records the assets, liabilities, and noncontrolling interest of the entity owning the property at fair value.
 
Mortgage Debt - Premiums and Discounts
 
Mortgage debt premiums and discounts represent fair value adjustments to account for the difference between the stated rates and market rates of mortgage debt assumed in connection with the Company’s property acquisitions.  The mortgage debt premiums and discounts are included in secured mortgage, construction, and bond debt on the accompanying consolidated balance sheets and are amortized to interest expense over the term of the related mortgage loans using the effective-interest method.  The amortization of mortgage debt premiums and discounts resulted in a net decrease to interest expense of approximately $4.9 million, $5.3 million, and $7.8 million for the years ended December 31, 2019, 2018, and 2017, respectively.  As of December 31, 2019 and 2018, net unamortized mortgage debt premiums were approximately $6.4 million and $11.6 million, respectively.
 
Tenant Reimbursements

Reimbursements from tenants, consisting of amounts due from tenants for utilities, are recognized as revenue in the period the recoverable costs are incurred. Tenant reimbursements are recognized and recorded on a gross basis, as the Company is generally the primary obligor with respect to purchasing goods and services from third-party suppliers, has discretion in selecting the supplier, and has credit risk.

Revenue Recognition and Accounts Receivable

The Company’s primary business involves leasing properties to students under agreements that are classified as operating leases, and which have terms of 12 months or less. When collection of substantially all lease payments during the lease term is considered probable, which the Company concludes to be the case at lease commencement, the lease qualifies for accrual accounting and lease payments are recognized on a straight-line basis. These student leases do not provide for variable rent payments. The Company is also a lessor under commercial leases at certain owned properties, some of which provide for variable lease payments based upon tenant performance such as a percentage of sales. The Company recognizes the base lease payments provided for under the leases on a straight-line basis over the lease term, and variable payments are recognized in the period in which the changes in facts and circumstances on which the variable payments are based occur.

If collection of substantially all lease payments during the lease term is not considered probable, adjustments are recognized as a reduction to lease income and, subsequently, any lease revenue is only recognized when cash receipts are received. In addition, the Company still maintains an allowance for uncollectible operating lease receivables to establish general reserves that are sufficient to absorb any adjustments to the probability of collection of substantially all lease payments. Determining the probability of collection of substantially all lease payments is impacted by numerous factors including tenant creditworthiness, economic conditions, and the Company's historical experience with tenants.

Third-Party Development Services Revenue
 
The Company recognizes development revenues and construction revenues over the life of the contract using a time-based measure of progress. An entire development and construction contract represents a single performance obligation comprised of a series of distinct services to be satisfied over time, and a single transaction price to be recognized over the life of the contract using a time-based measure of progress. Any variable consideration included in the transaction price is estimated using the expected value approach and is only included to the extent that a significant revenue reversal is not likely to occur.

Third-Party Development Services Costs

Pre-development expenditures such as architectural fees, permits and deposits associated with the pursuit of third-party and owned development projects are expensed as incurred, until such time that management believes it is probable that the contract will be executed and/or construction will commence, at which time the Company capitalizes the costs.  Because the Company frequently incurs these pre-development expenditures before a financing commitment and/or required permits and authorizations have been obtained, the Company bears the risk of loss of these pre-development expenditures if financing cannot ultimately be arranged on acceptable terms or the Company is unable to successfully obtain the required permits and authorizations.  As such, management evaluates the status of third-party and owned projects that have not yet commenced construction on a periodic basis and expenses any deferred costs related to projects whose current status indicates the commencement of construction is unlikely and/or the costs may not provide future value to the Company in the form of revenues.  Such write-offs are included in third-party development and management services expenses (in the case of third-party development projects) or general and administrative expenses (in the case of owned development projects) on the accompanying consolidated statements of comprehensive income.  As of December 31, 2019, the Company has deferred approximately $7.1 million in pre-development costs related to third-party and owned development projects that have not yet commenced construction.  Such costs are net of any contractual arrangements through which the Company could be reimbursed by another party. Such costs are included in other assets on the accompanying consolidated balance sheets.

Third-Party Management Services Revenue
 
Management fees are recognized when earned in accordance with each management contract. Incentive management fees are estimated using the expected value approach and are included in the transaction price only to the extent that a significant revenue reversal is not likely to occur. The Company evaluates the collectability of revenue earned from third-party management contracts and reserves any amounts deemed to be uncollectible based on the individual facts and circumstances of the projects and associated contracts.

Advertising Costs
 
Advertising costs are expensed during the period incurred, or as the advertising takes place, depending on the nature and term of the specific advertising arrangements.  Advertising expense approximated $15.7 million, $13.6 million and $12.7 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Derivative Instruments and Hedging Activities
 
The Company records all derivative financial instruments on the balance sheet at fair value.  Changes in fair value are recognized either in earnings or as other comprehensive income, depending on whether the derivative has been designated as a fair value or cash flow hedge and whether it qualifies as part of a hedging relationship, the nature of the exposure being hedged, and how effective the derivative is at offsetting movements in underlying exposure.  The Company discontinues hedge accounting when: (i) it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of a hedged item; (ii) the derivative expires or is sold, terminated, or exercised; (iii) it is no longer probable that the forecasted transaction will occur; or (iv) management determines that designating the derivative as a hedging instrument is no longer appropriate.  In all situations in which hedge accounting is discontinued and the derivative remains outstanding, the Company will carry the derivative at its fair value on the balance sheet, recognizing changes in the fair value in current-period earnings.  The Company uses interest rate swaps to effectively convert a portion of its floating rate debt to fixed rate, thus reducing the impact of rising interest rates on interest payments.  These instruments are designated as cash flow hedges and the interest differential to be paid or received is accrued as interest expense. The Company’s counter-parties are major financial institutions.  See Note 12 for an expanded discussion on derivative instruments and hedging activities.

Common Stock Issuances and Costs
 
Specific incremental costs directly attributable to the Company’s equity offerings are deferred and charged against the gross proceeds of the offering.  As such, underwriting commissions and other common stock issuance costs are reflected as a reduction of additional paid in capital.  See Note 10 for an expanded discussion on common stock issuances and costs.
 
Share-Based Compensation
 
Compensation expense associated with share-based awards is recognized in the consolidated statements of comprehensive income based on the grant-date fair values and is adjusted as actual forfeitures occur. Compensation expense is recognized over the period during which the employee is required to provide service in exchange for the award, which is generally the vesting period.  See Note 11 for an expanded discussion of the Company’s share-based compensation awards.

Income Taxes

The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”).  To qualify as a REIT, the Company must meet a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its adjusted taxable income to its stockholders.  As a REIT, the Company will generally not be subject to corporate level federal income tax on taxable income it currently distributes to its stockholders. If the Company fails to qualify as a REIT in any taxable year, it will be subject to federal income taxes at regular corporate rates (including any applicable alternative minimum tax) and may not be able to qualify as a REIT for the subsequent four taxable years.  Even if the Company qualifies for taxation as a REIT, the Company may be subject to certain state and local income and excise taxes on its income and property, and to federal income and excise taxes on its undistributed income.

The Company owns various TRSs, one of which manages the Company’s non-REIT activities and each of which is subject to federal, state and local income taxes.