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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income	$ 39,781	$ 29,230	$ 30,184	$ 18,058	$ 32,260	$ 35,489	$ 31,359	$ 19,145	$ 33,008	$ 32,897	$ 24,640	$ 16,705	$ 117,253	$ 118,253	$ 107,250
Private perpetual preferred unit distributions													(936)	(936)	(936)
Earnings allocated to unvested shares													(851)	(760)	(747)
Net income attributable to common unitholders - basic and diluted													$ 115,466	$ 116,557	$ 105,567
Denominator:
Weighted average units outstanding - basic and diluted (in shares)													297,258,000	296,455,000	276,848,000
Effect of dilutive securities, stock-based compensation plans (in shares)													1,000	775,000	454,000
Effect of dilutive securities, exchangeable senior notes (in shares)													0	819,000	266,000
Weighted average shares outstanding - diluted (in shares)													297,259,000	298,049,000	277,568,000
Earnings per unit - basic and diluted (in dollars per share)	$ 0.13	$ 0.10	$ 0.10	$ 0.06	$ 0.11	$ 0.12	$ 0.10	$ 0.06	$ 0.11	$ 0.12	$ 0.09	$ 0.06	$ 0.39	$ 0.39	$ 0.38
Antidilutive shares and LTIP units (in shares)													485,865	834,267	800,746

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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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