Earnings Per OP Unit of MAALP Statement (details) (Limited Partner [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic	79,336,000		79,023,000
Effect of dilutive securities	0	[1]	0	[1]
Weighted average common shares - diluted	79,336,000		79,023,000
Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	64,244		9,819
Income from continuing operations allocated to unvested restricted shares	(130)		(17)
Income from continuing operations available for common unitholders, adjusted	64,114		9,802
Income from discontinued operations	433		5,895
Income from discontinued operations allocated to unvested restricted shares	(1)		(10)
Income from discontinued operations available for common unitholders, adjusted	432		5,885
Earnings per unit - basic	0.81		0.20
Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	64,244		9,819
Income from continuing operations allocated to unvested restricted shares	(130)	[1]	(17)	[1]
Income from continuing operations available for common unitholders, adjusted	64,114		9,802
Income from discontinued operations	433		5,895
Income from discontinued operations allocated to unvested restricted shares	(1)	[1]	(10)	[1]
Income from discontinued operations available for common unitholders, adjusted	432		5,885
Earnings per unit - diluted	0.81		0.20
Restricted Stock [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	100,000		100,000

[1] (1) For both the three months ended March 31, 2015 and 2014, 0.1 million potentially dilutive securities and their related income are not included in the diluted earnings per share calculations as they are not dilutive.