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Fair Value of Instruments and Derivatives Fair Value of Instruments and Derivatives (Notes) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Fair Value Disclosures [Text Block] | Financial Instruments and Derivatives Financial Instruments Not Carried at Fair Value Cash and cash equivalents, restricted cash, and accrued expenses and other liabilities are carried at amounts that reasonably approximate their fair value due to their short term nature. Fixed rate notes payable at September 30, 2018 and December 31, 2017, totaled $3.5 billion and $3.2 billion, respectively, and had estimated fair values of $3.5 billion and $3.3 billion (excluding prepayment penalties) as of September 30, 2018 and December 31, 2017, respectively. The carrying values of variable rate notes payable (excluding the effect of interest rate swap and cap agreements) at September 30, 2018 and December 31, 2017, totaled $1.1 billion and $1.3 billion, respectively, and had estimated fair values of $1.1 billion and $1.3 billion (excluding prepayment penalties) as of September 30, 2018 and December 31, 2017, respectively. The fair values of fixed rate debt are determined by using the present value of future cash outflows discounted with the applicable current market rate plus a credit spread. The fair values of variable rate debt are determined using the stated variable rate plus the current market credit spread. The variable rates reset every 30 to 90 days, and management concluded that these rates reasonably estimate current market rates. Management has determined the inputs used to value the outstanding debt fall within Level 2 of the fair value hierarchy, and therefore, the fair market valuation of debt is considered Level 2 in the fair value hierarchy. Financial Instruments Measured at Fair Value on a Recurring Basis The Company uses interest rate swaps and interest rate caps to add stability to interest expense and to manage its exposure to interest rate movements. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. The fair value of interest rate derivative contracts designated as hedging instruments recorded in "Other assets" in the accompanying Condensed Consolidated Balance Sheets was $10.5 million and $3.6 million as of September 30, 2018 and December 31, 2017, respectively. The fair value of interest rate derivative contract liabilities recorded in "Accrued expenses and other liabilities" in the accompanying Condensed Consolidated Balance Sheets was $1.3 million as of December 31, 2017. There were no interest rate derivative contract liabilities as of September 30, 2018. To comply with the provisions of ASC Topic 820, management incorporates credit valuation adjustments to appropriately reflect both its nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of the derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. Based on guidance issued by the FASB, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. The derivative asset related to the redemption feature embedded in the MAA Series I preferred stock issued in connection with the merger with Post Properties is valued using widely accepted valuation techniques, including a discounted cash flow analysis in which the perpetual value of the preferred shares is compared to the value of the preferred shares assuming the call option is exercised, with the value of the bifurcated call option as the difference between the two values. This analysis reflects the contractual terms of the redeemable preferred shares, which are redeemable at the Company's option beginning on October 1, 2026 and at the redemption price of $50 per share (see Note 8). The analysis uses observable market-based inputs, including trading data available on the preferred shares, coupon yields on preferred stock issuances from REITs with similar credit ratings as MAA and treasury rates to determine the fair value of the bifurcated call option. The redemption feature embedded in the MAA Series I preferred stock is reported as a derivative asset in "Other assets" in the accompanying Condensed Consolidated Balance Sheets and is adjusted to its fair value at each reporting date, with a corresponding non-cash adjustment to "Other non-operating (expense) income" in the accompanying Condensed Consolidated Statements of Operations. As a result of mark-to-market adjustments of non-cash expense recorded to reflect the change in fair value of the derivative asset in the nine months ended September 30, 2018, the fair value of the embedded derivative slightly decreased to $20.9 million as of September 30, 2018 compared to $21.2 million as of December 31, 2017. The Company has determined the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, and as a result, all of its derivatives held as of September 30, 2018 and December 31, 2017 were classified as Level 2 in the fair value hierarchy. Cash Flow Hedges of Interest Rate Risk As of January 1, 2018, the Company early adopted ASU 2017-12, Derivatives and Hedging (Topic 815), which clarifies hedge accounting requirements, improves disclosure of hedging arrangements and better aligns risk management activities and financial reporting for hedging relationships. The Company adopted the standard using a modified retrospective approach via the elimination of the previously recorded cumulative ineffectiveness for cash flow and net investment hedges existing at date of adoption as a cumulative-effect adjustment of $0.2 million to accumulated other comprehensive income with a corresponding adjustment to the opening balance of retained earnings. The adoption of the ASU did not have a material impact on the consolidated financial statements or the Company's internal accounting policies. The changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in "Accumulated other comprehensive income" and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. In conjunction with the adoption of ASU 2017-12, as long as a hedging instrument is designated and the results of the effectiveness testing support that the instrument qualifies for hedge accounting treatment, there is no periodic measurement or recognition of ineffectiveness. Rather, the full impact of hedge gains and losses will be recognized in the period in which hedged transactions impact earnings, regardless of whether or not economic mismatches exist in the hedging relationship. Amounts reported in "Accumulated other comprehensive income" related to derivatives designated as qualifying cash flow hedges will be reclassified to interest expense as interest payments are made on the Company's variable rate or fixed rate debt. During the next twelve months, the Company estimates that an additional $3.9 million will be reclassified to earnings as a decrease to "Interest expense", which primarily represents the difference between the fixed interest rate swap payments and the projected variable interest rate swap receipts. As of September 30, 2018, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk:
Interest Rate Derivative |  | Number of Instruments |  | Notional Amount
Interest Rate Cap |  | 1 |  | $ | 25,000,000 |
Interest Rate Swaps(1) |  | 10 |  | $ | 300,000,000 |
(1) | Six forward rate swaps totaling $300.0 million, which hedge the first 10 years of interest payments on debt anticipated to be issued in the future are included in the number of instruments but excluded from the notional amount. These swaps are not included in the debt discussion in Note 6 or Management's Discussion and Analysis of Financial Condition and Results of Operations found elsewhere in this Quarterly Report on Form 10-Q.
Tabular Disclosure of the Effect of Derivative Instruments on the Condensed Consolidated Statements of Operations The tables below present the effect of the Company's derivative financial instruments on the Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2018 and 2017 (dollars in thousands):
Derivatives in Cash Flow Hedging Relationships |  | Amount of Gain (Loss) Recognized in OCI on Derivative |  | Location of Gain (Loss) Reclassified from Accumulated OCI into Income |  | Amount of Gain (Loss) Reclassified from Accumulated OCI into Interest Expense(1)
Three months ended September 30, |  | 2018 |  | 2017 |  |  | 2018 |  | 2017
Interest rate contracts |  | $ | 4,245 |  |  | $ | 90 |  |  | Interest Expense |  | $ | 548 |  |  | $ | 33 |
Nine months ended September 30, |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contracts |  | $ | 10,797 |  |  | $ | (1,252 | ) |  | Interest Expense |  | $ | 1,296 |  |  | $ | (884 | )
(1) See Note 4 for changes in accumulated other comprehensive income as these changes are presented net of the allocation to noncontrolling interests.
Derivatives Not Designated as Hedging Instruments |  | Location of (Loss) Gain Recognized in Income on Derivative |  | Amount of (Loss) Gain Recognized in Earnings on Derivative
For the three months ended September 30, |  |  | 2018 |  | 2017
Preferred stock embedded derivative |  | Other non-operating income |  | $ | (433 | ) |  | $ | 4,107 |
For the nine months ended September 30, |  |  |  |  |  |
Preferred stock embedded derivative |  | Other non-operating income |  | $ | (284 | ) |  | $ | 5,827 |
Credit-Risk-Related Contingent Features Certain of the Company's derivative contracts contain a provision where the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company's default on the indebtedness. As of September 30, 2018, the Company had not breached the provisions of these agreements. If the provisions had been breached, the Company could have been required to settle its obligations under the agreements although there was no termination value liability as of September 30, 2018. Although the Company's derivative contracts are subject to master netting arrangements, which serve as credit mitigants to both the Company and its counterparties under certain situations, the Company does not net its derivative fair values or any existing rights or obligations to cash collateral in the Condensed Consolidated Balance Sheets.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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