STOCKHOLDERS' INVESTMENT, EARNINGS PER SHARE AND ACCUMULATED COMPREHENSIVE INCOME Stockholder's Investment, earnings per share and accumulated other comprehensive income (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]
Common Stock, Capital Shares Reserved for Future Issuance										6,980,081
Common stock, shares outstanding - beginning balance	35,213,991				34,976,743					35,213,991	34,976,743
Issuance of restricted stock										312,634	237,248
Common stock, shares outstanding, ending balance		35,213,991				34,976,743				35,526,625	35,213,991	34,976,743
Weighted average price per share of issued restricted stock and restricted stock units										$ 11.27	$ 17.41
Common shares owned by foreign addresses										6,214,000
Percentage of total outstanding common shares owned by foreign addresses										17.00%
Cash dividends declared per common share	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.34	$ 0.34	$ 0.34	$ 0.07	$ 0.28	$ 1.09
Payments of Ordinary Dividends, Common Stock										$ 2,465	$ 9,831	$ 38,076