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Intangible Assets (Expected Future Amortization Expense) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2013 $ 10,425  
2014 12,655  
2015 11,174  
2016 10,759  
2017 9,427  
Thereafter 40,902  
Definite-llved intangible assets, net carrying amount $ 95,342 $ 98,802