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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic		79,436	79,356	79,424	79,346
Effect of dilutive securities	[1]	0	0	239	0
Weighted average common shares - diluted		79,436	79,356	79,663	79,346
Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations		$ 47,630	$ 143,873	$ 93,438	$ 208,550
Income from continuing operations allocated to unvested restricted shares		(134)	(337)	(237)	(446)
Income from continuing operations available for common unitholders, adjusted		$ 47,496	$ 143,536	$ 93,201	$ 208,104
Earnings per unit - basic		$ 0.60	$ 1.81	$ 1.17	$ 2.62
Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations		$ 47,630	$ 143,873	$ 93,438	$ 208,550
Income from continuing operations allocated to unvested restricted shares	[1]	(134)	(337)	0	(446)
Income from continuing operations available for common unitholders, adjusted		$ 47,496	$ 143,536	$ 93,438	$ 208,104
Earnings per unit - diluted		$ 0.60	$ 1.81	$ 1.17	$ 2.62
Restricted Stock [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		200

[1] (1) For the three months ended June 30, 2016 and for both the three and six months ended June 30, 2015, 0.2 million potentially dilutive securities and their related income are not included in the diluted earnings per unit calculations as they are not dilutive.