CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 26,667us-gaap_ProfitLoss	$ 19,644us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
(Gain) loss on extinguishment of debt, net	(2,245)	358
(Gain) loss on sale or write down of assets, net	(935)mac_GainLossonSaleorWriteDownofAssets	1,611mac_GainLossonSaleorWriteDownofAssets
Gain on remeasurement of assets	(22,103)	0
Depreciation and amortization	122,418	90,569
Amortization of net premium on mortgage notes payable	(6,903)	(1,352)
Amortization of share and unit-based plans	14,468us-gaap_ShareBasedCompensation	16,505us-gaap_ShareBasedCompensation
Straight-line rent adjustment	(386)us-gaap_StraightLineRentAdjustments	(1,491)us-gaap_StraightLineRentAdjustments
Amortization of above and below-market leases	(4,666)	(1,497)
Provision for doubtful accounts	1,330us-gaap_ProvisionForDoubtfulAccounts	372us-gaap_ProvisionForDoubtfulAccounts
Income tax benefit	(935)us-gaap_IncomeTaxExpenseBenefit	(172)us-gaap_IncomeTaxExpenseBenefit
Equity in income of unconsolidated joint ventures	(8,274)	(13,769)
Co-venture expense	2,130mac_IncomeLossFromCoventureOperations	1,820mac_IncomeLossFromCoventureOperations
Changes in assets and liabilities, net of acquisitions and dispositions:
Tenant and other receivables	17,836	8,817
Other assets	4,310	(1,536)
Due from affiliates	650	1,573
Accounts payable and accrued expenses	18,318	8,049
Other accrued liabilities	450	(31,590)
Net cash provided by operating activities	162,130	97,911
Cash flows from investing activities:
Acquisitions of property	(26,250)us-gaap_PaymentsToAcquireRealEstate	0us-gaap_PaymentsToAcquireRealEstate
Development, redevelopment, expansion and renovation of properties	(90,157)	(29,578)
Property improvements	(3,855)	(4,792)
Proceeds from notes receivable	452	0
Deferred leasing costs	(9,768)	(6,465)
Distributions from unconsolidated joint ventures	13,096	22,219
Contributions to unconsolidated joint ventures	(33,284)	(28,566)
Loans to unconsolidated joint ventures, net	0	(618)
Proceeds from sale of assets	1,440	24,514
Restricted cash	(1,694)	1,035
Net cash used in investing activities	(150,020)	(22,251)
Cash flows from financing activities:
Proceeds from mortgages, bank and other notes payable	815,671	133,982
Payments on mortgages, bank and other notes payable	(674,569)	(104,225)
Deferred financing costs	(3,476)us-gaap_PaymentsOfFinancingCosts	(550)us-gaap_PaymentsOfFinancingCosts
Payment of stock issuance costs	(304)us-gaap_PaymentsOfStockIssuanceCosts	0us-gaap_PaymentsOfStockIssuanceCosts
Redemption of noncontrolling interests	0us-gaap_PaymentsToMinorityShareholders	(203)us-gaap_PaymentsToMinorityShareholders
Payment of contingent consideration	0mac_PaymentsofContingentConsideration	(9,000)mac_PaymentsofContingentConsideration
Dividends and distributions	(111,462)us-gaap_PaymentsOfDividendsCommonStock	(95,342)us-gaap_PaymentsOfDividendsCommonStock
Distributions to co-venture partner	(4,716)mac_DistributionsToCoVenturePartner	(5,111)mac_DistributionsToCoVenturePartner
Net cash provided by (used in) financing activities	21,144	(80,449)
Net increase (decrease) in cash and cash equivalents	33,254	(4,789)
Cash and cash equivalents, beginning of period	84,907	69,715
Cash and cash equivalents, end of period	118,161	64,926
Supplemental cash flow information:
Cash payments for interest, net of amounts capitalized	60,102us-gaap_InterestPaidNet	47,958us-gaap_InterestPaidNet
Non-cash investing and financing transactions:
Accrued development costs included in accounts payable and accrued expenses and other accrued liabilities	31,823	37,852
Assumption of mortgage note payable from unconsolidated joint venture	50,000us-gaap_LiabilitiesAssumed1	0us-gaap_LiabilitiesAssumed1
Acquisition of property in exchange for investment in unconsolidated joint venture	76,250	0
Notes receivable issued in connection with sale of property	0us-gaap_NotesIssued1	9,603us-gaap_NotesIssued1
Conversion of Operating Partnership Units to common stock	$ 1,553	$ 627

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