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
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic	117,689	117,557
Effect of dilutive securities	0	307
Weighted average common shares - diluted	117,689	117,864
Dividends, Preferred Stock, Cash	$ 922	$ 922
Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	50,820	43,416
Income from continuing operations allocated to unvested restricted shares	(79)	(73)
Dividends, Preferred Stock, Cash	(922)	(922)
Income from continuing operations available for common unitholders, adjusted	$ 49,819	$ 42,421
Earnings per unit - basic	$ 0.42	$ 0.36
Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 50,820	$ 43,416
Income from continuing operations allocated to unvested restricted shares	(79)	0
Dividends, Preferred Stock, Cash	(922)	(922)
Income from continuing operations available for common unitholders, adjusted	$ 49,819	$ 42,494
Earnings per unit - diluted	$ 0.42	$ 0.36
Restricted Stock [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200