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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 26,784	$ 29,230	$ 55,570	$ 77,472
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Earnings allocated to unvested units	(243)	(212)	(646)	(586)
Net income attributable to common unitholders - basic and diluted	$ 26,307	$ 28,784	$ 54,222	$ 76,184
Denominator:
Weighted average units outstanding - basic (in units)	298,151,000	297,478,000	298,117,000	297,180,000
Effect of dilutive securities:
Stock-based compensation plans (in units)	0	0	0	1,000
Weighted average units outstanding - diluted (in units)	298,151,000	297,478,000	298,117,000	297,181,000
Earnings per share:
Basic (in USD per unit)	$ 0.09	$ 0.10	$ 0.18	$ 0.26
Diluted (in USD per unit)	$ 0.09	$ 0.10	$ 0.18	$ 0.26
Antidilutive securities (in units)	452,457	541,947	288,053	458,698

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