MAALP Capital (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
General Partners' Capital Account [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Units Issued During Period, Value, Unit Options Exercised			$ 218
Total Partnership Capital [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Units Issued During Period, Value, Unit Options Exercised			218
Limited Partner [Member]
Capital Disclosure [Line Items]
Noncontrolling Interest in Joint Ventures	$ 2,306		$ 2,306		$ 2,306
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.87	$ 0.82	$ 2.61	$ 2.46
Increase (Decrease) in Partners' Capital [Roll Forward]
Dividends, Preferred Stock, Cash			$ 2,766	$ 0
Limited Partner [Member] | General Partners' Capital Account [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance			6,337,721	2,993,696	2,993,696
Net Income Allocated to General Partners			202,163	172,836
Issuance of units			154	(738)
Units repurchased and retired			(4,782)	(1,811)
General partner units issued in exchange for limited partner units			1,133	780
Units issued in exchange for redeemable units			1,482	122
Redeemable stock fair market value			(870)	(296)
Adjustment for noncontrolling interest ownership in operating partnership			68	(13)
Amortization of unearned compensation			8,438	6,625
Distributions			(296,535)	(185,789)
Ending Balance	$ 6,249,190	$ 2,985,412	6,249,190	2,985,412	6,337,721
Limited Partner [Member] | Total Partnership Capital [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance			6,642,082	3,157,804	3,157,804
Net Income Available for Common Unitholders			212,529	182,344
Other comprehensive (loss) income - derivatives insturments (cash flow hedges)			(368)	(481)
Issuance of units			2,161	(738)
Units repurchased and retired			(4,782)	(1,811)
General partner units issued in exchange for limited partner units			0	0
Units issued in exchange for redeemable units			1,482	122
Redeemable stock fair market value			(870)	(296)
Adjustment for noncontrolling interest ownership in operating partnership			0	0
Amortization of unearned compensation			8,438	6,625
Distributions			(307,517)	(196,006)
Dividends, Preferred Stock, Cash			2,766
Ending Balance	6,550,607	3,147,563	6,550,607	3,147,563	6,642,082
Limited Partner [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance			235,976	165,726	165,726
Net Income Allocated to Limited Partners			7,600	9,508
General partner units issued in exchange for limited partner units			(1,133)	(780)
Adjustment for noncontrolling interest ownership in operating partnership			(68)	13
Distributions			(10,982)	(10,217)
Ending Balance	231,393	164,250	231,393	164,250	235,976
Limited Partner [Member] | AOCI Attributable to Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance			1,246	(1,618)	(1,618)
Other comprehensive (loss) income - derivatives insturments (cash flow hedges)			(368)	(481)
Ending Balance	878	$ (2,099)	878	(2,099)	1,246
Accumulated Distributions in Excess of Net Income [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Redeemable stock fair market value				$ (296)
Accumulated Distributions in Excess of Net Income [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Issuance of units			2,007		$ 64,833
Dividends, Preferred Stock, Cash			2,766
Preferred Stock Including Additional Paid in Capital [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Ending Balance	$ 66,840		$ 66,840