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Supplemental Cash Flow Information (Schedule of Supplemental Cash Flow Information) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Supplemental Cash Flow Information
Employee share-based compensation	$ 3,707	$ 2,746	$ 7,163	$ 5,408
Unrealized gains on available for sale securities, net			48	4
Cash paid for income taxes			53,274	17,432
Cash paid for interest			2,050	2,050
Cash received for stock option exercises			2,858	1,256
Cash received for employee stock purchase plan			$ 248	$ 158

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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