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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	744,007	677,605	628,935	576,975
Numerator:
Net income	$ 26,585	$ 25,281	$ 34,473	$ 36,512
Private perpetual preferred unit distributions	(234)	0	(468)	0
Earnings allocated to unvested units	(161)	(108)	(284)	(247)
Net income attributable to common unitholders - basic and diluted	$ 26,190	$ 25,173	$ 33,721	$ 36,265
Denominator:
Weighted average units outstanding - basic and diluted	265,867,000	244,436,000	265,866,000	244,431,000
Earnings per unit - basic and diluted	$ 0.10	$ 0.10	$ 0.13	$ 0.15

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

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Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]

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

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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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