Basis of Presentation - Schedule of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Basic earnings per share calculation:
Net income	$ 19,754	$ 9,753
Weighted-average basic shares outstanding	30,613,284	24,138,437
Basic earnings per share	$ 0.65	$ 0.40
Diluted earnings per share:
Net income	$ 19,754	$ 9,753
Weighted-average basic shares outstanding	30,613,284	24,138,437
Average diluted common shares outstanding	808,546	472,554
Weighted-average diluted shares outstanding	31,421,830	24,610,991
Diluted earnings per share	$ 0.63	$ 0.40

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

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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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