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Earnings Per OP Unit of MAALP Earnings Per OP Unit of MAALP (Details) - Limited Partner [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic	117,796	117,643	117,768	117,607
Effect of dilutive securities	239	219	201	270
Weighted average common shares - diluted	118,035	117,862	117,969	117,877
Dividends, Preferred Stock, Cash			$ 2,766	$ 2,766
Earnings per unit - basic	$ 0.46	$ 1.00	$ 1.40	$ 1.78
Earnings per unit - diluted	$ 0.46	$ 1.00	$ 1.40	$ 1.78
Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 54,704	$ 118,958	$ 167,505	$ 212,529
Income from continuing operations allocated to unvested restricted shares	(69)	(181)	(211)	(337)
Dividends, Preferred Stock, Cash	(922)	(922)	(2,766)	(2,766)
Income from continuing operations available for common unitholders, adjusted	$ 53,713	$ 117,855	$ 164,528	$ 209,426
Earnings per unit - basic	$ 0.46	$ 1.00	$ 1.40	$ 1.78
Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 54,704	$ 118,958	$ 167,505	$ 212,529
Dividends, Preferred Stock, Cash	(922)	(922)	(2,766)	(2,766)
Income from continuing operations available for common unitholders, adjusted	$ 53,782	$ 118,036	$ 164,739	$ 209,763
Earnings per unit - diluted	$ 0.46	$ 1.00	$ 1.40	$ 1.78

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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