SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION CF (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Cash Flow [Line Items]
Net cash provided by (used in) operating activities				$ 193,942	$ 115,399
Capital expenditures				(250,425)	(122,748)
Deposits on assets held for sale				0	1,000
Proceeds from sale of joint ventures				0	1,291
Proceeds from asset dispositions				103,537	17,175
Net cash used in investing activities				(146,888)	(103,282)
Proceeds from borrowings				159,993	253,013
Debt issuance costs				(871)	(3,339)
Repayment of debt and debt redemption premiums				(36,214)	(246,553)
Dividends paid	(5,400)	(5,400)	(5,400)	(16,236)	0
Distributions to noncontrolling interest owners				0	(637)
Increases (decreases) in cash related to intercompany advances and debt				0	0
Partial Prepayment Of Put Call Obligation				(47)	(44)
Acquisition of noncontrolling interest				(262)	(800)
Repuchase of common stock				(25,085)	0
Issuance of Common Stock				2,611	754
Tax benefit related to stock-based compensation				130	230
Net cash provided by (used in) financing activities				84,019	2,624
Effect of exchange rate changes on cash and cash equivalents				(2,526)	8,329
Net increase (decrease) in cash and cash equivalents				128,547	23,070
Cash and cash equivalents at beginning of period			116,361	116,361	77,793
Cash and cash equivalents at end of period	244,908			244,908	100,863
Parent Company [Member]
Cash Flow [Line Items]
Net cash provided by (used in) operating activities				(24,226)	(46,074)
Capital expenditures				(2,505)	(2,378)
Deposits on assets held for sale					0
Proceeds from sale of joint ventures					0
Proceeds from asset dispositions				0	0
Net cash used in investing activities				(2,505)	(2,378)
Proceeds from borrowings				159,300	243,000
Debt issuance costs				(871)	(3,339)
Repayment of debt and debt redemption premiums				(32,500)	(230,000)
Dividends paid				35,161	21,535
Distributions to noncontrolling interest owners					0
Increases (decreases) in cash related to intercompany advances and debt				(25,724)	12,600
Partial Prepayment Of Put Call Obligation				(47)	(44)
Acquisition of noncontrolling interest				0	0
Repuchase of common stock				(25,085)
Issuance of Common Stock				2,611	754
Tax benefit related to stock-based compensation				130	230
Net cash provided by (used in) financing activities				112,975	44,736
Effect of exchange rate changes on cash and cash equivalents				0	3,835
Net increase (decrease) in cash and cash equivalents				86,244	119
Cash and cash equivalents at beginning of period			24,075	24,075	16,555
Cash and cash equivalents at end of period	110,319			110,319	16,674
Guarantor Subsidiaries [Member]
Cash Flow [Line Items]
Net cash provided by (used in) operating activities				67,176	24,656
Capital expenditures				(158,437)	(30,957)
Deposits on assets held for sale					1,000
Proceeds from sale of joint ventures					0
Proceeds from asset dispositions				71,672	11,281
Net cash used in investing activities				(86,765)	(18,676)
Proceeds from borrowings				0	8,050
Debt issuance costs				0	0
Repayment of debt and debt redemption premiums				0	0
Dividends paid				(24,927)	(11,500)
Distributions to noncontrolling interest owners					0
Increases (decreases) in cash related to intercompany advances and debt				42,061	(4,364)
Partial Prepayment Of Put Call Obligation				0	0
Acquisition of noncontrolling interest				(262)	0
Repuchase of common stock				0
Issuance of Common Stock				0	0
Tax benefit related to stock-based compensation				0	0
Net cash provided by (used in) financing activities				16,872	(7,814)
Effect of exchange rate changes on cash and cash equivalents				0	0
Net increase (decrease) in cash and cash equivalents				(2,717)	(1,834)
Cash and cash equivalents at beginning of period			5,233	5,233	1,834
Cash and cash equivalents at end of period	2,516			2,516	0
Non-Guarantor Subsidiaries [Member]
Cash Flow [Line Items]
Net cash provided by (used in) operating activities				150,992	137,535
Capital expenditures				(89,483)	(89,413)
Deposits on assets held for sale					0
Proceeds from sale of joint ventures					1,291
Proceeds from asset dispositions				31,865	5,894
Net cash used in investing activities				(57,618)	(82,228)
Proceeds from borrowings				693	1,963
Debt issuance costs				0	0
Repayment of debt and debt redemption premiums				(3,714)	(16,553)
Dividends paid				(26,470)	(10,035)
Distributions to noncontrolling interest owners					(637)
Increases (decreases) in cash related to intercompany advances and debt				(16,337)	(8,236)
Partial Prepayment Of Put Call Obligation				0	0
Acquisition of noncontrolling interest				0	(800)
Repuchase of common stock				0
Issuance of Common Stock				0	0
Tax benefit related to stock-based compensation				0	0
Net cash provided by (used in) financing activities				(45,828)	(34,298)
Effect of exchange rate changes on cash and cash equivalents				(2,526)	4,494
Net increase (decrease) in cash and cash equivalents				45,020	25,503
Cash and cash equivalents at beginning of period			87,053	87,053	59,404
Cash and cash equivalents at end of period	132,073			132,073	84,907
Consolidations, Eliminations [Member]
Cash Flow [Line Items]
Net cash provided by (used in) operating activities				0	(718)
Capital expenditures				0	0
Deposits on assets held for sale					0
Proceeds from sale of joint ventures					0
Proceeds from asset dispositions				0	0
Net cash used in investing activities				0	0
Proceeds from borrowings				0	0
Debt issuance costs				0	0
Repayment of debt and debt redemption premiums				0	0
Dividends paid				0	0
Distributions to noncontrolling interest owners					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
Repuchase of common stock				0
Issuance of Common Stock				0	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	(718)
Cash and cash equivalents at beginning of period			0	0	0
Cash and cash equivalents at end of period	$ 0			$ 0	$ (718)