Deferred Revenue (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Components of Deferred Revenue
Current portion	$ 46,816	$ 55,372
Deferred revenue, Non-current portion	1,978	1,764
Deferred revenue	48,794	57,136
Software License Arrangement [Member]
Components of Deferred Revenue
Deferred revenue	12,933	20,608
Software Service, Support and Maintenance Arrangement [Member]
Components of Deferred Revenue
Deferred revenue	$ 35,861	$ 36,528

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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