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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Components of accumulated other comprehensive income    
Accumulated unrealized gains on available-for-sale securities, net of tax $ 10,088 $ 8,916
Accumulated unrealized gain (losses) on hedging transactions, net of tax (5,565) (3,101)
Accumulated cumulative translation adjustment 394 1,449
Accumulated other comprehensive income $ 4,917 $ 7,264 [1]
[1] Derived from audited financial statements