Earnings Per OP Unit of MAALP Statement (details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share Disclosure [Line Items]
Dividends, Preferred Stock, Cash				$ 0
Limited Partner [Member]
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic	117,619	79,436	117,589	79,424
Effect of dilutive securities	211	0	279	239
Weighted average common shares - diluted	117,830	79,436	117,868	79,663
Dividends, Preferred Stock, Cash			$ 1,844	$ 0
Limited Partner [Member] | Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 50,155	$ 47,630	93,571	93,438
Income from continuing operations allocated to unvested restricted shares	(76)	(134)	(149)	(237)
Dividends, Preferred Stock, Cash	(922)	0	(1,844)	0
Income from continuing operations available for common unitholders, adjusted	$ 49,157	$ 47,496	$ 91,578	$ 93,201
Earnings per unit - basic	$ 0.42	$ 0.60	$ 0.78	$ 1.17
Limited Partner [Member] | Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations	$ 50,155	$ 47,630	$ 93,571	$ 93,438
Income from continuing operations allocated to unvested restricted shares	0	(134)	0	0
Dividends, Preferred Stock, Cash	(922)	0	(1,844)	0
Income from continuing operations available for common unitholders, adjusted	$ 49,233	$ 47,496	$ 91,727	$ 93,438
Earnings per unit - diluted	$ 0.42	$ 0.60	$ 0.78	$ 1.17
Limited Partner [Member] | Restricted Stock [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			200