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Capitalized Software Costs (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Capitalized software development costs
Gross carrying amount	$ 85,369	$ 65,221
Accumulated amortization	(52,488)	(45,227)
Net capitalized software costs	$ 32,881	$ 19,994	$ 18,733	$ 15,150

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.