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Debt (Schedule of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Long-term Debt, Current and Noncurrent [Abstract]    
Long-term debt $ 1,715,173 $ 965,425
Less: Current portion of long-term debt (55,562) (42,500)
Long-term debt, net of current portion 1,659,611 922,925
Secured Debt | Tranche A Loans
   
Long-term Debt, Current and Noncurrent [Abstract]    
Interest rate 2.70% 2.49%
Long-term debt 706,134 472,870
Secured Debt | Tranche B Loans
   
Long-term Debt, Current and Noncurrent [Abstract]    
Interest rate 4.50% 3.75%
Long-term debt $ 1,009,039 $ 492,555