CONDENSED STATEMENTS OF CONSOLIDATED STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Retained Deficit	Currency Translation Adjustment	Pensions, Net of Tax	Loss on Derivatives, Net of Tax	Noncontrolling Interests
Balance at beginning of period at Mar. 31, 2017	$ 206,710	$ 472,349	$ (208,784)	$ (22,293)	$ (36,654)	$ (1,100)	$ 3,192
Statement of Consolidated Stockholders' Equity
Net (loss) income	(32,633)		(32,543)				(90)
Stock-based compensation	291	291
Other comprehensive income (loss), net of tax	3,639			3,742	459	(562)
Balance at end of period at Jun. 30, 2017	178,007	472,640	(241,327)	(18,551)	(36,195)	(1,662)	3,102
Balance at beginning of period at Mar. 31, 2017	206,710	472,349	(208,784)	(22,293)	(36,654)	(1,100)	3,192
Statement of Consolidated Stockholders' Equity
Net (loss) income	56,647
Other comprehensive income (loss), net of tax	8,294
Balance at end of period at Dec. 31, 2017	272,722	473,156	(151,848)	(15,476)	(35,278)	(999)	3,167
Balance at beginning of period at Jun. 30, 2017	178,007	472,640	(241,327)	(18,551)	(36,195)	(1,662)	3,102
Statement of Consolidated Stockholders' Equity
Net (loss) income	956		1,024				(68)
Restricted stock surrender	(2)	(2)
Stock-based compensation	253	253
Other comprehensive income (loss), net of tax	2,879			2,349	459	71
Balance at end of period at Sep. 30, 2017	182,092	472,892	(240,304)	(16,202)	(35,736)	(1,591)	3,033
Statement of Consolidated Stockholders' Equity
Net (loss) income	88,326		88,456				(130)
Restricted stock surrender	(6)	(6)
Stock-based compensation	270	270
Purchase of investment in subsidiary	264						264
Other comprehensive income (loss), net of tax	1,776			726	458	592
Balance at end of period at Dec. 31, 2017	272,722	473,156	(151,848)	(15,476)	(35,278)	(999)	3,167
Balance at beginning of period at Mar. 31, 2018	282,828	473,476	(156,348)	(12,682)	(32,580)	0	10,962
Statement of Consolidated Stockholders' Equity
Net (loss) income	(1,413)		(759)				(654)
Stock-based compensation	295	295
Purchase of investment in subsidiary	5,531						5,531
Other comprehensive income (loss), net of tax	(6,441)			(5,136)	366	(1,496)	(175)
Balance at end of period at Jun. 30, 2018	280,800	473,771	(157,107)	(17,818)	(32,214)	(1,496)	15,664
Balance at beginning of period at Mar. 31, 2018	282,828	473,476	(156,348)	(12,682)	(32,580)	0	10,962
Statement of Consolidated Stockholders' Equity
Net (loss) income	(61,256)
Other comprehensive income (loss), net of tax	(9,473)
Balance at end of period at Dec. 31, 2018	218,367	474,603	(213,905)	(19,862)	(35,049)	(2,307)	14,887
Balance at beginning of period at Jun. 30, 2018	280,800	473,771	(157,107)	(17,818)	(32,214)	(1,496)	15,664
Statement of Consolidated Stockholders' Equity
Net (loss) income	(54,842)		(54,634)				(208)
Restricted stock surrender	(8)	(8)
Stock-based compensation	458	458
Other comprehensive income (loss), net of tax	1,747			(257)	973	780	251
Balance at end of period at Sep. 30, 2018	228,155	474,221	(211,741)	(18,075)	(31,241)	(716)	15,707
Statement of Consolidated Stockholders' Equity
Impact of adoption of ASU 2018-02			2,931		(2,931)
Net (loss) income	(5,002)		(5,095)				93
Restricted stock surrender	(20)	(20)
Stock-based compensation	402	402
Dividends paid	(390)						(390)
Other comprehensive income (loss), net of tax	(4,778)			(1,787)	(877)	(1,591)	(523)
Balance at end of period at Dec. 31, 2018	$ 218,367	$ 474,603	$ (213,905)	$ (19,862)	$ (35,049)	$ (2,307)	$ 14,887