Summary of Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Quarterly Results (Unaudited) [Abstract]

Schedule Of Quarterly Financial Information [Table Text Block]

(Amounts in thousands, except per unit amounts)				Net Income
				Attributable		Net Income Per
				to Class A		Class A Unit (2)
		Revenues		Unitholders (1)		Basic		Diluted
2015
	December 31	$	651,581	$	245,735	$	1.22	$	1.21
	September 30		627,596		211,526		1.05		1.05
	June 30		616,288		175,800		0.88		0.87
	March 31		606,802		89,868		0.45		0.44
2014
	December 31	$	597,010	$	544,287	$	2.73	$	2.71
	September 30		578,710		139,134		0.70		0.69
	June 30		574,411		81,333		0.41		0.40
	March 31		562,381		66,197		0.33		0.33
(1)	Fluctuations among quarters resulted primarily from non-cash impairment losses, mark-to-market of derivative instruments, net gains on sale of real estate and from seasonality of business operations.
(2)	The total for the year may differ from the sum of the quarters as a result of weighting.