Stockholders' Equity (Additional Information To Restricted Stock Activity) (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Income tax benefit | $ (865) | $ (1,157) | $ (2,714) | $ (3,073) |
Restricted Stock Units [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Intrinsic value | 1,980 | 1,179 | ||
| Income tax benefit | $ 99 | $ 14 | ||