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Earnings Per Share - Basic (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic earnings per share
Net income available for common stockholders	$ 174,751	$ 4,580
Less: Dividends and undistributed earnings allocated to participating securities	(3,213)	(353)
Net income available for common stockholders, net of dividends and undistributed earnings allocated to participating securities	$ 171,538	$ 4,227
Weighted average shares of common stock outstanding
Outstanding (in shares)	90,699,321	40,398,381
Basic Earnings per share (in dollars per share)	$ 1.89	$ 0.10
Class A
Weighted average shares of common stock outstanding
Outstanding (in shares)	90,699,321	40,398,381

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- Definition

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 portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of earnings (loss) distributed and 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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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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