Earnings Per OP Unit of MAALP Statement (details) - Limited Partner [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic		79,374	79,263	79,356	79,148
Effect of dilutive securities	[1]	0	0	0	0
Weighted average common shares - diluted		79,374	79,263	79,356	79,148
Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations		$ 96,828	$ 70,827	$ 305,378	$ 114,500
Income from continuing operations allocated to unvested restricted shares		(221)	(131)	(668)	(212)
Income from continuing operations available for common unitholders, adjusted		96,607	70,696	304,710	114,288
Income from discontinued operations		0	(108)	0	5,319
Income from discontinued operations allocated to unvested restricted shares		0	0	0	(10)
Income from discontinued operations available for common unitholders, adjusted		$ 0	$ (108)	$ 0	$ 5,309
Earnings per unit - basic		$ 1.22	$ 0.89	$ 3.84	$ 1.51
Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations		$ 96,828	$ 70,827	$ 305,378	$ 114,500
Income from continuing operations allocated to unvested restricted shares	[1]	(221)	(131)	(668)	(212)
Income from continuing operations available for common unitholders, adjusted		96,607	70,696	304,710	114,288
Income from discontinued operations		0	(108)	0	5,319
Income from discontinued operations allocated to unvested restricted shares		0	0	0	(10)	[1]
Income from discontinued operations available for common unitholders, adjusted		$ 0	$ (108)	$ 0	$ 5,309
Earnings per unit - diluted		$ 1.22	$ 0.89	$ 3.84	$ 1.51
Restricted Stock [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		200		100

[1] (1) For the three and nine months ended September 30, 2015 and September 30, 2014, 0.2 million and 0.1 million, respectively, potentially dilutive securities and their related income are not included in the diluted earnings per share calculations as they are not dilutive.