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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income	$ 9,856	$ 18,058
Private perpetual preferred unit distributions	(234)	(234)
Earnings allocated to unvested units	(153)	(162)
Net income attributable to common unitholders - basic and diluted	$ 9,469	$ 17,662
Denominator:
Weighted average units outstanding - basic (in units)	298,049,000	296,824,000
Effect of dilutive securities:
Effect of dilutive securities - stock-based compensation plans (in units)	0	3,000
Weighted average units outstanding - diluted (in units)	298,049,000	296,827,000
Earnings per share:
Basic earnings (in USD per unit)	$ 0.03	$ 0.06
Diluted earnings (in USD per unit)	$ 0.03	$ 0.06
Antidilutive securities (in units)	684	419,347

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