Earnings Per OP Unit of MAALP Statement (details) - Limited Partner [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic	79,356		79,156		79,346		79,090
Effect of dilutive securities	0	[1]	0	[1]	0	[1]	162
Weighted average common shares - diluted	79,356		79,156		79,346		79,252
Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 143,873		$ 33,391		$ 208,550		$ 43,673
Income from continuing operations allocated to unvested restricted shares	(337)		(64)		(446)		(81)
Income from continuing operations available for common unitholders, adjusted	143,536		33,327		208,104		43,592
Income from discontinued operations	0		(5)		0		5,427
Income from discontinued operations allocated to unvested restricted shares	0		0		0		(10)
Income from discontinued operations available for common unitholders, adjusted	$ 0		$ (5)		$ 0		$ 5,417
Earnings per unit - basic	$ 1.81		$ 0.42		$ 2.62		$ 0.62
Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 143,873		$ 33,391		$ 208,550		$ 43,673
Income from continuing operations allocated to unvested restricted shares	(337)	[1]	(64)	[1]	(446)	[1]	0
Income from continuing operations available for common unitholders, adjusted	143,536		33,327		208,104		43,673
Income from discontinued operations	0		(5)		0		5,427
Income from discontinued operations allocated to unvested restricted shares	0		0		0		0
Income from discontinued operations available for common unitholders, adjusted	$ 0		$ (5)		$ 0		$ 5,427
Earnings per unit - diluted	$ 1.81		$ 0.42		$ 2.62		$ 0.62
Restricted Stock [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount					200

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