CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND REDEEMABLE NONCONTROLLING INTEREST - 6 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interests
Redeemable noncontrolling interest, beginning period at Mar. 31, 2017	$ 6,886
Increase (Decrease) in Temporary Equity [Roll Forward]
Currency translation adjustments	452
Net loss	(1,336)
Redeemable noncontrolling interest, ending balance at Sep. 30, 2017	6,002
Balance as of March 31, 2017 at Mar. 31, 2017	$ 1,294,232	$ 379	$ 809,995	$ 991,906	$ (328,277)	$ (184,796)	$ 5,025
Common stock, shares beginning balance at Mar. 31, 2017	35,213,991	35,213,991
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	$ 5,997	$ 2	5,995
Issuance of common stock, shares		147,545
Distributions paid to noncontrolling interests	(23)						(23)
Common stock dividends ($0.07 per share)	(2,465)			(2,465)
Currency translation adjustments	95						95
Net loss	(85,806)			(86,484)			678
Other comprehensive income	20,998				20,998
Balance as of September 30, 2017 at Sep. 30, 2017	$ 1,233,028	$ 381	$ 815,990	$ 902,957	$ (307,279)	$ (184,796)	$ 5,775
Common stock, shares ending balance at Sep. 30, 2017	35,361,536	35,361,536