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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 32,897	$ 26,085	$ 74,242	$ 60,558
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Earnings allocated to unvested units	(225)	(161)	(575)	(425)
Net income attributable to common unitholders - basic and diluted	$ 32,438	$ 25,690	$ 72,965	$ 59,431
Denominator:
Weighted average units outstanding - basic (in units)	278,739,000	265,873,000	270,388,000	265,868,000
Effect of dilutive securities - stock-based compensation plans (in units)	1,090,000	0	378,000	0
Effect of dilutive securities - exchangeable senior notes (in units)	785,000	0	262,000	0
Weighted average units outstanding - diluted (in units)	280,614,000	265,873,000	271,028,000	265,868,000
Earnings per unit - basic and diluted (in USD per share)	$ 0.12	$ 0.10	$ 0.27	$ 0.22
Antidilutive securities (in units)		802,462		692,209

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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