Debt (Long-term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Total long-term debt
8 5/8% Senior Secured Notes due February 1, 2018	$ 675,000	$ 675,000
Convertible Notes due September 2013	55,750	60,000
Other, including capital lease obligations and other loans at interest rates averaging approximately 6.2% due in installments through 2018	20,457	18,363
Total	751,207	753,363
Fair value adjustments on hedged debt (see Note 2 - interest rate swaps)	2,788	3,354
Total	753,995	756,717
Less-current maturities	60,131	3,787
Total Long-Term Debt	$ 693,864	$ 752,930
Senior Secured Notes | 8.625% Senior Secured Notes Due February 2018
Debt Instrument [Line Items]
Interest rate, stated percentage	8.625%
Capital Lease Obligations | 6.2% Capital Lease Obligations Due on Installments through 2018
Debt Instrument [Line Items]
Interest rate, effective percentage	6.20%