Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net income	$ 19,145	$ 16,705
Private perpetual preferred unit distributions	(234)	(234)
Earnings allocated to unvested units	(154)	(172)
Net income attributable to common unitholders - basic and diluted	$ 18,757	$ 16,299
Denominator:
Weighted average units outstanding - basic (in units)	296,388,000	266,134,000
Effect of dilutive securities:
Effect of dilutive securities - stock-based compensation plans (in units)	775,000	0
Effect of dilutive securities - exchangeable senior notes (in units)	799,000	0
Weighted average units outstanding - diluted (in units)	297,962,000	266,134,000
Earnings per unit - basic and diluted
Earnings per unit - basic and diluted (in USD per share)	$ 0.06	$ 0.06
Antidilutive securities (in units)	622,565	507,205

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 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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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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