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Goodwill And Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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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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| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | $ 68,684,000 | $ 56,873,000 | |
| Accumulated Amortization | (15,570,000) | (6,613,000) | |
| Net Carrying Amount | 53,114,000 | 50,260,000 | |
| Amortization expense related to intangible assets | 9,300,000 | 4,500,000 | 1,500,000 |
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Acquired Methodologies/Technology [Member]
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| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 11,244,000 | 10,157,000 | |
| Accumulated Amortization | (3,307,000) | (1,633,000) | |
| Net Carrying Amount | 7,937,000 | 8,524,000 | |
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Customer Relationships [Member]
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| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 38,157,000 | 38,471,000 | |
| Accumulated Amortization | (7,698,000) | (3,140,000) | |
| Net Carrying Amount | 30,459,000 | 35,331,000 | |
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Panel [Member]
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| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 1,615,000 | 1,615,000 | |
| Accumulated Amortization | (826,000) | (597,000) | |
| Net Carrying Amount | 789,000 | 1,018,000 | |
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Intellectual Property [Member]
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| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 13,561,000 | 2,561,000 | |
| Accumulated Amortization | (918,000) | (662,000) | |
| Net Carrying Amount | 12,643,000 | 1,899,000 | |
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Trade Name [Member]
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| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 4,107,000 | 4,069,000 | |
| Accumulated Amortization | (2,821,000) | (581,000) | |
| Net Carrying Amount | $ 1,286,000 | $ 3,488,000 | |