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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic	117,643	79,449	117,607	79,432
Effect of dilutive securities	219	0	270	246
Weighted average common shares - diluted	117,862	79,449	117,877	79,678
Dividends, Preferred Stock, Cash			$ 2,766	$ 0
Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 118,958	$ 88,906	212,529	182,344
Income from continuing operations allocated to unvested restricted shares	(181)	(254)	(337)	(484)
Dividends, Preferred Stock, Cash	(922)	0	(2,766)	0
Income from continuing operations available for common unitholders, adjusted	$ 117,855	$ 88,652	$ 209,426	$ 181,860
Earnings per unit - basic	$ 1.00	$ 1.12	$ 1.78	$ 2.29
Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 118,958	$ 88,906	$ 212,529	$ 182,344
Income from continuing operations allocated to unvested restricted shares	0	(254)	0	0
Dividends, Preferred Stock, Cash	(922)	0	(2,766)	0
Income from continuing operations available for common unitholders, adjusted	$ 118,036	$ 88,652	$ 209,763	$ 182,344
Earnings per unit - diluted	$ 1.00	$ 1.12	$ 1.78	$ 2.29
Restricted Stock [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		200