Earnings Per Share ("EPS") (Details) - USD ($)	3 Months Ended						9 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 35,825,264	$ 537,950	$ 12,168,005	$ 35,628,912	$ 40,711,896	$ 6,075,059	$ 48,531,219	$ 82,415,867
Denominator:
Basic weighted average number of common shares outstanding (in shares)	50,255,908			53,944,991			50,511,473	54,380,855
Effect of dilutive restricted stock and restricted stock units (in shares)	112,484			231,757			94,512	234,988
Diluted weighted average number of common shares outstanding (in shares)	50,368,392			54,176,748			50,605,985	54,615,843
EPS:
Basic (in dollars per share)	$ 0.71			$ 0.66			$ 0.96	$ 1.52
Diluted (in dollars per share)	$ 0.71			$ 0.66			$ 0.96	$ 1.51
Restricted stock awards
EPS:
Number of shares excluded from the calculation of diluted EPS	0			0			0	0