Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 24,180	$ 59,756
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,139	40,299
Deferred income taxes	(10,237)	4,385
Amortization of debt discount	1,666	1,565
Gain (loss) on disposal of assets	195	(3,615)
Impairment of inventories	24,610	0
Gain on sales of joint ventures	0	(572)
Stock-based compensation	7,480	8,019
Equity in earnings from unconsolidated affiliates less than dividends received	5,285	(890)
Tax benefit related to stock-based compensation	(109)	(179)
Increase (decrease) in cash resulting from changes in:
Accounts receivable	(6,352)	(24,940)
Inventories	7,916	(3,000)
Prepaid expenses and other assets	3,297	(14,363)
Accounts payable	5,382	9,774
Accrued liabilities	4,863	(2,917)
Other liabilities and deferred credits	678	(4,138)
Net cash provided by operating activities	116,993	69,184
Cash flows from investing activities:
Capital expenditures	(149,262)	(63,943)
Deposits on assets held for sale	0	1,000
Proceeds from sales of joint ventures	0	1,291
Proceeds from asset dispositions	12,040	17,178
Net cash used in investing activities	(137,222)	(44,474)
Cash flows from financing activities:
Proceeds from borrowings	88,493	10,012
Repayment of debt	(32,518)	(7,630)
Distributions to noncontrolling interest owners	0	(637)
Partial prepayment of put/call obligation	(31)	(28)
Acquisition of noncontrolling interest	(262)	(800)
Common stock dividends paid	(10,833)	0
Issuance of common stock	1,629	111
Tax benefit related to stock-based compensation	109	179
Net cash provided by (used in) financing activities	46,587	1,207
Effect of exchange rate changes on cash and cash equivalents	(2,440)	4,791
Net increase (decrease) in cash and cash equivalents	23,918	30,708
Cash and cash equivalents at beginning of period	116,361	77,793
Cash and cash equivalents at end of period	140,279	108,501
Supplemental disclosure of cash flow information:
Interest	18,937	22,856
Income taxes	$ 9,171	$ 7,559