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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income	$ 28,720	$ 26,784	$ 18,930	$ 9,856	$ 39,781	$ 29,230	$ 30,184	$ 18,058	$ 32,260	$ 35,489	$ 31,359	$ 19,145	$ 84,290	$ 117,253	$ 118,253
Private perpetual preferred unit distributions													(1,743)	(936)	(936)
Earnings allocated to unvested shares													(885)	(851)	(760)
Net income attributable to common unitholders - basic and diluted													$ 81,662	$ 115,466	$ 116,557
Denominator:
Weighted average units outstanding - basic and diluted (in shares)													297,798,000	297,258,000	296,455,000
Effect of dilutive securities, stock-based compensation plans (in shares)													0	1,000	775,000
Effect of dilutive securities, exchangeable senior notes (in shares)													0	0	819,000
Weighted average shares outstanding - diluted (in shares)													297,798,000	297,259,000	298,049,000
Earnings per unit - basic and diluted (in dollars per share)	$ 0.09	$ 0.09	$ 0.06	$ 0.03	$ 0.13	$ 0.10	$ 0.10	$ 0.06	$ 0.11	$ 0.12	$ 0.10	$ 0.06	$ 0.27	$ 0.39	$ 0.39
Antidilutive shares and LTIP units (in shares)													416,492	485,865	834,267

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