SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities				$ (68,902)	$ (9,307)
Capital expenditures	$ (16,409)		$ (12,124)	(33,711)	(36,441)
Proceeds from asset dispositions	631		6,303	9,093	48,547
Proceeds from OEM cost recoveries				0	94,463
Net cash provided by (used in) investing activities				(24,618)	106,569
Proceeds from borrowings				387	548,768
Debt issuance costs				(2,599)	(11,653)
Repayment of debt				(49,116)	(609,667)
Purchase of 4½% Convertible Senior Notes call option				0	(40,393)
Proceeds from issuance of warrants				0	30,259
Dividends paid				0	(2,465)
Increases (decreases) in cash related to intercompany advances and debt				0	0
Partial prepayment of put/call obligation				(40)	(36)
Dividends paid to noncontrolling interest		$ (580)		(580)	0
Issuance of common stock				2,830	0
Repurchases for tax withholdings on vesting of equity awards				(1,505)	(591)
Net cash used in financing activities				(50,623)	(85,778)
Effect of exchange rate changes on cash and cash equivalents				(4,754)	9,708
Net increase (decrease) in cash and cash equivalents				(148,897)	21,192
Cash and cash equivalents at beginning of period				380,223	96,656
Cash and cash equivalents at end of period	231,326		117,848	231,326	117,848
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities				(1,501)	(922)
Capital expenditures				0	77,480
Proceeds from asset dispositions				0	(77,480)
Proceeds from OEM cost recoveries					0
Net cash provided by (used in) investing activities				0	0
Proceeds from borrowings				0	0
Debt issuance costs				0	0
Repayment of debt				0	0
Purchase of 4½% Convertible Senior Notes call option					0
Proceeds from issuance of warrants					0
Dividends paid				0	0
Increases (decreases) in cash related to intercompany advances and debt				0	0
Partial prepayment of put/call obligation				0	0
Dividends paid to noncontrolling interest				0
Issuance of common stock				0
Repurchases for tax withholdings on vesting of equity awards				0	0
Net cash used in financing activities				0	0
Effect of exchange rate changes on cash and cash equivalents				0	0
Net increase (decrease) in cash and cash equivalents				(1,501)	(922)
Cash and cash equivalents at beginning of period				0	0
Cash and cash equivalents at end of period	(1,501)		(922)	(1,501)	(922)
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities				(93,365)	(105,817)
Capital expenditures				(2,987)	(8,182)
Proceeds from asset dispositions				0	0
Proceeds from OEM cost recoveries					0
Net cash provided by (used in) investing activities				(2,987)	(8,182)
Proceeds from borrowings				0	318,550
Debt issuance costs				(642)	(2,558)
Repayment of debt				0	(569,325)
Purchase of 4½% Convertible Senior Notes call option					(40,393)
Proceeds from issuance of warrants					30,259
Dividends paid				162,941	110,637
Increases (decreases) in cash related to intercompany advances and debt				(189,241)	291,969
Partial prepayment of put/call obligation				(40)	(36)
Dividends paid to noncontrolling interest				0
Issuance of common stock				2,830
Repurchases for tax withholdings on vesting of equity awards				(1,505)	(591)
Net cash used in financing activities				(25,657)	138,512
Effect of exchange rate changes on cash and cash equivalents				0	0
Net increase (decrease) in cash and cash equivalents				(122,009)	24,513
Cash and cash equivalents at beginning of period				277,176	3,382
Cash and cash equivalents at end of period	155,167		27,895	155,167	27,895
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities				23,819	34,995
Capital expenditures				(12,827)	(7,755)
Proceeds from asset dispositions				7,529	85,760
Proceeds from OEM cost recoveries					0
Net cash provided by (used in) investing activities				(5,298)	78,005
Proceeds from borrowings				0	0
Debt issuance costs				(32)	(552)
Repayment of debt				(15,709)	(13,137)
Purchase of 4½% Convertible Senior Notes call option					0
Proceeds from issuance of warrants					0
Dividends paid				1,649	0
Increases (decreases) in cash related to intercompany advances and debt				(13,333)	(99,610)
Partial prepayment of put/call obligation				0	0
Dividends paid to noncontrolling interest				0
Issuance of common stock				0
Repurchases for tax withholdings on vesting of equity awards				0	0
Net cash used in financing activities				(27,425)	(113,299)
Effect of exchange rate changes on cash and cash equivalents				0	0
Net increase (decrease) in cash and cash equivalents				(8,904)	(299)
Cash and cash equivalents at beginning of period				8,904	299
Cash and cash equivalents at end of period	0		0	0	0
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities				2,145	62,437
Capital expenditures				(17,897)	(97,984)
Proceeds from asset dispositions				1,564	40,267
Proceeds from OEM cost recoveries					94,463
Net cash provided by (used in) investing activities				(16,333)	36,746
Proceeds from borrowings				387	230,218
Debt issuance costs				(1,925)	(8,543)
Repayment of debt				(33,407)	(27,205)
Purchase of 4½% Convertible Senior Notes call option					0
Proceeds from issuance of warrants					0
Dividends paid				(164,590)	(113,102)
Increases (decreases) in cash related to intercompany advances and debt				202,574	(192,359)
Partial prepayment of put/call obligation				0	0
Dividends paid to noncontrolling interest				(580)
Issuance of common stock				0
Repurchases for tax withholdings on vesting of equity awards				0	0
Net cash used in financing activities				2,459	(110,991)
Effect of exchange rate changes on cash and cash equivalents				(4,754)	9,708
Net increase (decrease) in cash and cash equivalents				(16,483)	(2,100)
Cash and cash equivalents at beginning of period				94,143	92,975
Cash and cash equivalents at end of period	$ 77,660		$ 90,875	$ 77,660	$ 90,875