Earnings per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ (33,223)
Income per common unit - diluted
Weighted Average Limited Partnership Units Outstanding, Basic	154,170	154,170,000
Parent Company [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ (33,223)	$ 47,877
Weighted average common units outstanding for basic EPU (in shares)	126,649,000	97,518,000
Weighted average common units outstanding for diluted EPU (in shares)	126,649,000	97,891,000
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ (0.26)	$ 0.49
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ (0.26)	$ 0.49
Partnership Interest [Member]
Earnings Per Share [Abstract]
Weighted average common units outstanding for basic EPU (in shares)	126,803,000	97,672,000
Weighted average common units outstanding for diluted EPU (in shares)	126,803,000	98,045,000
Income per common unit - basic
Continuing operations (in dollars per share)	$ (0.26)	$ 0.49
Income per common unit - diluted
Continuing operations (in dollars per share)	$ (0.26)	$ 0.49
Continuing Operations [Member] \| Parent Company [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ (33,223)	$ 47,877
Net income for common stock unit/holders - diluted	(33,223)	47,877
Continuing Operations [Member] \| Partnership Interest [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	(33,242)	47,962
Net income for common stock unit/holders - diluted	$ (33,242)	$ 47,962

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Per unit of ownership amount after tax of income (loss) from continuing operations available to limited partnership (LP) unit-holder and units that would have been outstanding assuming the issuance of limited partner units for dilutive potential units outstanding.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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Per unit of ownership amount after tax of income (loss) from continuing operations available to limited partnership (LP) unit-holder in a publicly trade limited partnership (LP) or master limited partnership (MLP).

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Weighted average number of limited partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership units have been outstanding to the total time in that 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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