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Summary of Significant Accounting Policies (Internal-Use Software) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Summary of Significant Accounting Policies
Internal-use software development costs	$ 4,735	$ 2,933	$ 7,993	$ 3,961

The cash outflow associated with the development or modification of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

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