CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND REDEEMABLE NONCONTROLLING INTEREST - 9 months ended Dec. 31, 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	489
Net loss	(3,516)
Redeemable noncontrolling interest, ending balance at Dec. 31, 2017	3,859
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	$ 8,188	$ 2	8,186
Issuance of common stock, shares		161,389
Equity component of 4½% Convertible Senior Notes issued	36,778		36,778
Purchase of 4½% Convertible Senior Notes call option	(40,393)		(40,393)
Proceeds from issuance of warrants	30,259		30,259
Distributions paid to noncontrolling interests	(36)						(36)
Common stock dividends ($0.07 per share)	(2,465)			(2,465)
Currency translation adjustments	41						41
Net loss	(93,563)			(94,757)			1,194
Other comprehensive income	20,924				20,924
Balance as of December 31, 2017 at Dec. 31, 2017	$ 1,253,965	$ 381	$ 844,825	$ 894,684	$ (307,353)	$ (184,796)	$ 6,224
Common stock, shares ending balance at Dec. 31, 2017	35,375,380	35,375,380