Earnings per Share (Details 1) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net income/(loss) available to common stockholders for basic and diluted earnings per share	$ (3,855,055)	$ (3,665,002)	$ (1,526,910)	$ 9,396,088	$ 11,287,077	$ 19,022,258	$ 37,797,929	$ 27,818,888	$ 349,121	$ 95,926,152	$ (45,048,052)
Denominator:
Basic weighted average common shares outstanding (in shares)									28,398,718	28,379,782	28,022,565
Dilutive effect of restricted stock units (in shares)									11,190	44,386	0
Dilutive weighted average common shares outstanding (in shares)									28,409,908	28,424,168	28,022,565
Basic Earnings/(Loss) Per Share of Common Stock: (in dollars per share)	$ (0.14)	$ (0.13)	$ (0.05)	$ 0.33	$ 0.40	$ 0.67	$ 1.33	$ 0.98	$ 0.01	$ 3.38	$ (1.61)
Diluted Earnings/(Loss) Per Share of Common Stock: (in dollars per share)	$ (0.14)	$ (0.13)	$ (0.05)	$ 0.33	$ 0.40	$ 0.67	$ 1.33	$ 0.98	$ 0.01	$ 3.37	$ (1.61)