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Earnings per Share - Schedule of Calculation of Basic and Diluted Earnings per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ (766,000)	$ 9,755,000	$ 6,146,000	$ 6,560,000	$ 63,915,000	$ 1,565,000	$ 2,601,000	$ (1,352,000)	$ 21,695,000	$ 66,729,000	$ (14,974,000)
Dividends on preferred shares	196,000	195,000	10,697,000	189,000					11,277,000
Net income (loss) available to common stockholders	$ (962,000)	$ 9,560,000	$ (4,551,000)	$ 6,371,000	$ 63,915,000	$ 1,565,000	$ 2,601,000	$ (1,352,000)	$ 10,418,000	$ 66,729,000	$ (14,974,000)
Weighted-average common stock outstanding:
Weighted-average common stock outstanding (basic)									26,963,517	20,141,630	17,332,775
Incremental shares									583,797	289,153
Weighted-average common stock outstanding (dilutive)									27,547,314	20,430,783	17,332,775
Basic earnings per common share	$ (0.03)	$ 0.33	$ (0.18)	$ 0.26	$ 2.66	$ 0.08	$ 0.13	$ (0.08)	$ 0.39	$ 3.31	$ (0.86)
Diluted earnings per common share	$ (0.03)	$ 0.32	$ (0.18)	$ 0.25	$ 2.62	$ 0.08	$ 0.13	$ (0.08)	$ 0.38	$ 3.27	$ (0.86)

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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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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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