Condensed Consolidated Statements of Shareholders Equity - USD ($)	Common stock	Treasury stock	Additional paid-in capital	Retained earnings/(Accumulated deficit)	Total
Balance at Mar. 31, 2015	$ 580,575		$ 844,539,059	$ 28,094,625	$ 873,214,259
Balance (in shares) at Mar. 31, 2015	58,057,493
Increase (Decrease) in Shareholders' Equity
Net income/(loss)				109,527,470	109,527,470
Stock-based compensation			2,684,152		2,684,152
Purchase of treasury stock		$ (10,070,645)			(10,070,645)
Balance at Dec. 31, 2015	$ 580,575	(10,070,645)	847,223,211	137,622,095	975,355,236
Balance (in shares) at Dec. 31, 2015	58,057,493
Balance at Mar. 31, 2016	$ 580,575	(20,943,816)	848,179,471	157,783,007	985,599,237
Balance (in shares) at Mar. 31, 2016	58,057,493
Increase (Decrease) in Shareholders' Equity
Net income/(loss)				(3,397,085)	(3,397,085)
Restricted share award issuances	$ 2,775		(2,775)
Restricted share award issuances (in shares)	277,514
Stock-based compensation			3,650,778		3,650,778
Purchase of treasury stock		(12,953,453)			(12,953,453)
Balance at Dec. 31, 2016	$ 583,350	$ (33,897,269)	$ 851,827,474	$ 154,385,922	$ 972,899,477
Balance (in shares) at Dec. 31, 2016	58,335,007