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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 29,230	$ 35,489	$ 77,472	$ 85,993
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Earnings allocated to unvested units	(212)	(228)	(586)	(582)
Net income attributable to common unitholders - basic and diluted	$ 28,784	$ 35,027	$ 76,184	$ 84,709
Denominator:
Weighted average units outstanding - basic (in units)	297,478,000	296,389,000	297,180,000	296,389,000
Effect of dilutive securities:
Effect of dilutive securities - stock-based compensation plans (in units)	0	762,000	1,000	848,000
Effect of dilutive securities - exchangeable senior notes (in units)	0	720,000	0	852,000
Weighted average units outstanding - diluted (in units)	297,478,000	297,871,000	297,181,000	298,089,000
Earnings per share:
Basic earnings (in USD per unit)	$ 0.10	$ 0.12	$ 0.26	$ 0.29
Diluted earnings (in USD per unit)	$ 0.10	$ 0.12	$ 0.26	$ 0.28
Antidilutive securities (in units)	541,947	954,533	458,698	840,092

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