SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION CF (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			$ 55,684	$ 162,410
Capital expenditures	$ (196,376)	$ (197,166)	(343,365)	(499,285)
Proceeds from asset dispositions	3,045	6,717	19,152	404,361
Proceeds from sale of unconsolidated affiliates			0	4,185
Net cash provided by (used in) investing activities			(324,213)	(90,739)
Proceeds from borrowings			910,421	347,860
Repayment of debt			(567,121)	(373,169)
Dividends paid			(35,627)	(33,935)
Increases (decreases) in cash related to intercompany advances and debt			0	0
Partial prepayment of put/call obligation			(42)	(46)
Acquisition of noncontrolling interest			(7,311)	(3,170)
Dividends paid to noncontrolling interest			(153)	0
Payment of contingent consideration			(8,000)	0
Repurchase of Common Stock		(37,400)	0	(80,831)
Issuance of Common Stock			0	2,217
Tax benefit related to stock-based compensation			44	1,642
Net cash provided by (used in) financing activities			292,211	(139,432)
Effect of exchange rate changes on cash and cash equivalents			4,080	(15,214)
Net increase (decrease) in cash and cash equivalents			27,762	(82,975)
Cash and cash equivalents at beginning of period			104,146	204,341
Cash and cash equivalents at end of period	131,908	121,366	131,908	121,366
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			(111,132)	(88,788)
Capital expenditures			(24,633)	(38,303)
Proceeds from asset dispositions			0	0
Proceeds from sale of unconsolidated affiliates				0
Net cash provided by (used in) investing activities			(24,633)	(38,303)
Proceeds from borrowings			893,025	346,500
Repayment of debt			(542,900)	(363,872)
Dividends paid			(35,627)	(33,935)
Increases (decreases) in cash related to intercompany advances and debt			(178,140)	255,878
Partial prepayment of put/call obligation			(42)	(46)
Acquisition of noncontrolling interest			0	0
Dividends paid to noncontrolling interest			0
Payment of contingent consideration			0
Repurchase of Common Stock				(80,831)
Issuance of Common Stock				2,217
Tax benefit related to stock-based compensation			44	1,642
Net cash provided by (used in) financing activities			136,360	127,553
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			595	462
Cash and cash equivalents at beginning of period			126	4,640
Cash and cash equivalents at end of period	721	5,102	721	5,102
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			104,553	263,933
Capital expenditures			(258,365)	(303,951)
Proceeds from asset dispositions			15,192	209,523
Proceeds from sale of unconsolidated affiliates				0
Net cash provided by (used in) investing activities			(243,173)	(94,428)
Proceeds from borrowings			0	0
Repayment of debt			0	0
Dividends paid			0	0
Increases (decreases) in cash related to intercompany advances and debt			138,564	(169,111)
Partial prepayment of put/call obligation			0	0
Acquisition of noncontrolling interest			0	0
Dividends paid to noncontrolling interest			0
Payment of contingent consideration			0
Repurchase of Common Stock				0
Issuance of Common Stock				0
Tax benefit related to stock-based compensation			0	0
Net cash provided by (used in) financing activities			138,564	(169,111)
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			(56)	394
Cash and cash equivalents at beginning of period			884	0
Cash and cash equivalents at end of period	828	394	828	394
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			62,263	(13,181)
Capital expenditures			(60,367)	(157,031)
Proceeds from asset dispositions			3,960	194,838
Proceeds from sale of unconsolidated affiliates				4,185
Net cash provided by (used in) investing activities			(56,407)	41,992
Proceeds from borrowings			17,396	1,360
Repayment of debt			(24,221)	(9,297)
Dividends paid			0	0
Increases (decreases) in cash related to intercompany advances and debt			39,576	(86,767)
Partial prepayment of put/call obligation			0	0
Acquisition of noncontrolling interest			(7,311)	(3,170)
Dividends paid to noncontrolling interest			(153)
Payment of contingent consideration			(8,000)
Repurchase of Common Stock				0
Issuance of Common Stock				0
Tax benefit related to stock-based compensation			0	0
Net cash provided by (used in) financing activities			17,287	(97,874)
Effect of exchange rate changes on cash and cash equivalents			4,080	(15,214)
Net increase (decrease) in cash and cash equivalents			27,223	(84,277)
Cash and cash equivalents at beginning of period			103,136	200,147
Cash and cash equivalents at end of period	130,359	115,870	130,359	115,870
Consolidations, Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			0	446
Capital expenditures			0	0
Proceeds from asset dispositions			0	0
Proceeds from sale of unconsolidated affiliates				0
Net cash provided by (used in) investing activities			0	0
Proceeds from borrowings			0	0
Repayment of debt			0	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
Acquisition of noncontrolling interest			0	0
Dividends paid to noncontrolling interest			0
Payment of contingent consideration			0
Repurchase of Common Stock				0
Issuance of Common Stock				0
Tax benefit related to stock-based compensation			0	0
Net cash provided by (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			0	446
Cash and cash equivalents at beginning of period			0	(446)
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0	$ 0