Earnings Per Share , Calculation of Numerator and Denominator (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Numerator
Net income / (loss) attributable to common stockholders	$ 12,364	$ (7,803)	$ 33,468	$ 72	$ 72
Allocation to restricted stock awards	(9)	242	(267)		179
Basic earnings: Net income / (loss) attributable to common stockholders after allocation	12,355	(7,561)	33,201		251
Allocation to restricted stock awards	9	(242)	267		(179)
Diluted earnings: Net income / (loss) attributable to common stockholders after allocation	$ 12,364	$ (7,803)	$ 33,468		$ 72
Denominator
Weighted average common shares outstanding	74,678	64,757	73,677	61,247	61,247
Add: dilutive stock options	2	0	2		9
Add: dilutive restricted stock	474	0	593		417
Diluted weighted average common shares and securities	75,154	64,757	74,272	61,673	61,673
Basic	$ 0.16	$ (0.12)	$ 0.45	$ 0.00	$ 0.00
Diluted	$ 0.16	$ (0.12)	$ 0.45	$ 0.00	$ 0.00

Income (Loss) From Continuing Operations Allocable To Non Vested Restricted Shares

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Net income attributable to common shareholders after restricted stock allocation

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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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 share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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