CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 26,912	$ 24,196
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,819	21,372
Deferred income taxes	11,768	(6,071)
Write-off of deferred debt financing fees	12,733	0
Amortization of debt discount	921	870
Loss on disposal of assets	1,721	5,315
Stock-based compensation	2,869	2,848
Equity in earnings from unconsolidated affiliates less than dividends received	(4,974)	4,129
Tax benefit related to stock-based compensation	(2,522)	(404)
Increase (decrease) in cash resulting from changes in:
Accounts receivable	(6,949)	(10,081)
Inventories	(4,112)	(1,869)
Prepaid expenses and other assets	(791)	3,816
Accounts payable	4,339	960
Accrued liabilities	(18,782)	11,212
Other liabilities and deferred credits	(9,539)	(881)
Net cash provided by operating activities	36,413	55,412
Cash flows from investing activities:
Capital expenditures	(179,532)	(86,555)
Proceeds from asset dispositions	1,893	20,227
Investment in unconsolidated affiliate	0	(850)
Net cash used in investing activities	(177,639)	(67,178)
Cash flows from financing activities:
Proceeds from borrowings	103,357	0
Debt issuance costs	(12,733)	0
Repayment of debt	(1,733)	(21,800)
Partial prepayment of put/call obligation	(14)	(17)
Common stock dividends paid	(9,045)	(7,145)
Issuance of common stock	3,004	311
Tax benefit related to stock-based compensation	2,522	404
Net cash provided by (used in) financing activities	85,358	(28,247)
Effect of exchange rate changes on cash and cash equivalents	237	5,713
Net increase (decrease) in cash and cash equivalents	(55,631)	(34,300)
Cash and cash equivalents at beginning of period	215,623	261,550
Cash and cash equivalents at end of period	159,992	227,250
Supplemental disclosure of cash flow information:
Interest	17,348	3,124
Income taxes	$ 10,081	$ 6,498