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Quarterly Financial Information (Amortization Of Stock-Based Compensation) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2010
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Jun. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Quarterly Financial Information [Line Items] | |||||||||||
| Allocated Share-based Compensation Expense | $ 3,100 | $ 3,800 | |||||||||
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Cost Of Revenues [Member]
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| Quarterly Financial Information [Line Items] | |||||||||||
| Allocated Share-based Compensation Expense | 395 | 514 | 605 | 462 | 449 | 569 | 246 | 230 | 1,976 | 1,494 | 1,186 |
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Selling And Marketing Expense [Member]
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| Quarterly Financial Information [Line Items] | |||||||||||
| Allocated Share-based Compensation Expense | 2,202 | 2,291 | 2,066 | 1,953 | 1,882 | 2,079 | 1,037 | 1,219 | 8,512 | 6,217 | 4,617 |
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Research And Development Expense [Member]
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| Quarterly Financial Information [Line Items] | |||||||||||
| Allocated Share-based Compensation Expense | 394 | 536 | 627 | 431 | 590 | 699 | 315 | 264 | 1,988 | 1,868 | 1,111 |
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General And Administrative Expense [Member]
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| Quarterly Financial Information [Line Items] | |||||||||||
| Allocated Share-based Compensation Expense | $ 1,829 | $ 2,069 | $ 2,208 | $ 2,678 | $ 2,938 | $ 2,407 | $ 1,889 | $ 961 | $ 8,784 | $ 8,195 | $ 2,942 |