Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income	$ 35,489	$ 32,897	$ 85,993	$ 74,242
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Earnings allocated to unvested units	(228)	(225)	(582)	(575)
Net income attributable to common unitholders - basic and diluted	$ 35,027	$ 32,438	$ 84,709	$ 72,965
Denominator:
Weighted average units outstanding - basic (in units)	296,389,000	278,739,000	296,389,000	270,388,000
Effect of dilutive securities:
Effect of dilutive securities - stock-based compensation plans (in units)	762,000	1,090,000	848,000	378,000
Effect of dilutive securities - exchangeable senior notes (in units)	720,000	785,000	852,000	262,000
Weighted average units outstanding - diluted (in units)	297,871,000	280,614,000	298,089,000	271,028,000
Earnings per share:
Basic earnings (in USD per unit)	$ 0.12	$ 0.12	$ 0.29	$ 0.27
Diluted earnings (in USD per unit)	$ 0.12	$ 0.12	$ 0.28	$ 0.27
Antidilutive securities (in units)	954,533	1,033,044	840,092	757,119

Net Income (Loss) Available to Common Stockholders, Basic and Diluted [Abstract]

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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 (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (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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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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