SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION CF (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 15,937	$ 37,345
Capital expenditures	(67,777)	(200,447)
Proceeds from asset dispositions	9,301	6,643
Net cash used in investing activities	(58,476)	(193,804)
Proceeds from borrowings	364,774	148,044
Debt issuance costs	0
Repayment of debt	(285,589)	(35,848)
Dividends paid	(11,871)	(11,353)
Increases (decreases) in cash related to intercompany advances and debt	0	0
Partial prepayment of put/call obligation	(14)	(15)
Acquisition of noncontrolling interest	(2,000)	0
Payment of contingent consideration	(8,000)	0
Repurchase of Common Stock	0	(20,157)
Issuance of Common Stock	0	975
Tax benefit related to stock-based compensation	337	166
Net cash provided by financing activities	57,637	81,812
Effect of exchange rate changes on cash and cash equivalents	1,150	4,110
Net increase (decrease) in cash and cash equivalents	16,248	(70,537)
Cash and cash equivalents at beginning of period	104,146	204,341
Cash and cash equivalents at end of period	120,394	133,804
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(61,581)	(22,755)
Capital expenditures	(8,034)	(11,219)
Proceeds from asset dispositions	0	0
Net cash used in investing activities	(8,034)	(11,219)
Proceeds from borrowings	364,774	147,500
Debt issuance costs	0
Repayment of debt	(282,831)	(31,891)
Dividends paid	(11,871)	(11,353)
Increases (decreases) in cash related to intercompany advances and debt	7,561	(49,231)
Partial prepayment of put/call obligation	(14)	(15)
Acquisition of noncontrolling interest	0
Payment of contingent consideration	0
Repurchase of Common Stock	0	(20,157)
Issuance of Common Stock	0	975
Tax benefit related to stock-based compensation	337	166
Net cash provided by financing activities	77,956	35,994
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	8,341	2,020
Cash and cash equivalents at beginning of period	126	4,640
Cash and cash equivalents at end of period	8,467	6,660
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	54,056	54,360
Capital expenditures	(24,091)	(98,694)
Proceeds from asset dispositions	8,932	6,423
Net cash used in investing activities	(15,159)	(92,271)
Proceeds from borrowings	0	0
Debt issuance costs	0
Repayment of debt	0	0
Dividends paid	0	0
Increases (decreases) in cash related to intercompany advances and debt	(39,781)	37,911
Partial prepayment of put/call obligation	0	0
Acquisition of noncontrolling interest	0
Payment of contingent consideration	0
Repurchase of Common Stock	0	0
Issuance of Common Stock	0	0
Tax benefit related to stock-based compensation	0	0
Net cash provided by financing activities	(39,781)	37,911
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(884)	0
Cash and cash equivalents at beginning of period	884	0
Cash and cash equivalents at end of period	0	0
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	23,594	7,158
Capital expenditures	(35,652)	(90,534)
Proceeds from asset dispositions	369	220
Net cash used in investing activities	(35,283)	(90,314)
Proceeds from borrowings	0	544
Debt issuance costs	0
Repayment of debt	(2,758)	(3,957)
Dividends paid	0	0
Increases (decreases) in cash related to intercompany advances and debt	32,220	11,320
Partial prepayment of put/call obligation	0	0
Acquisition of noncontrolling interest	(2,000)
Payment of contingent consideration	(8,000)
Repurchase of Common Stock	0	0
Issuance of Common Stock	0	0
Tax benefit related to stock-based compensation	0	0
Net cash provided by financing activities	19,462	7,907
Effect of exchange rate changes on cash and cash equivalents	1,150	4,110
Net increase (decrease) in cash and cash equivalents	8,923	(71,139)
Cash and cash equivalents at beginning of period	103,136	200,147
Cash and cash equivalents at end of period	112,059	129,008
Consolidations, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(132)	(1,418)
Capital expenditures	0	0
Proceeds from asset dispositions	0	0
Net cash used in investing activities	0	0
Proceeds from borrowings	0	0
Debt issuance costs	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
Payment of contingent consideration	0
Repurchase of Common Stock	0	0
Issuance of Common Stock	0	0
Tax benefit related to stock-based compensation	0	0
Net cash provided by financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(132)	(1,418)
Cash and cash equivalents at beginning of period	0	(446)
Cash and cash equivalents at end of period	$ (132)	$ (1,864)