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Capitalized Software Costs (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Capitalized software development costs        
Gross carrying amount $ 69,554 $ 65,221    
Accumulated amortization (47,689) (45,227)    
Net capitalized software costs $ 21,865 $ 19,994 $ 15,738 $ 15,150