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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income	$ 32,260	$ 35,489	$ 31,359	$ 19,145	$ 33,008	$ 32,897	$ 24,640	$ 16,705	$ 19,370	$ 26,085	$ 26,585	$ 7,888	$ 118,253	$ 107,250	$ 79,928
Private perpetual preferred unit distributions													(936)	(936)	(936)
Earnings allocated to unvested shares													(760)	(747)	(550)
Net income attributable to common unitholders - basic and diluted													$ 116,557	$ 105,567	$ 78,442
Denominator:
Weighted average units outstanding - basic and diluted (in shares)													296,455,000	276,848,000	265,914,000
Effect of dilutive securities, stock-based compensation plans (in shares)													775,000	454,000	0
Effect of dilutive securities, exchangeable senior notes (in shares)													819,000	266,000	0
Weighted average shares outstanding - diluted (in shares)													298,049,000	277,568,000	265,914,000
Earnings per unit - basic and diluted (in dollars per share)	$ 0.11	$ 0.12	$ 0.10	$ 0.06	$ 0.11	$ 0.12	$ 0.09	$ 0.06	$ 0.07	$ 0.10	$ 0.10	$ 0.03	$ 0.39	$ 0.38	$ 0.29
Antidilutive shares and LTIP units (in shares)													834,267	800,746	706,865

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Net Income Loss Excluding Portion Attributable to Noncontrolling Interest and Participating Securities Basic and Diluted

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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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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.

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