|
Summary of Significant Accounting Policies Realized Gain (Loss) on Short-Term Investments (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
|
| Cash, Cash Equivalents, and Short-term Investments [Abstract] | |||
| Available-for-sale Securities, Gross Realized Gains | $ 37 | $ 64 | $ 181 |
| Available-for-sale Securities, Gross Realized Losses | (274) | (234) | (104) |
| Available-for-sale Securities, Gross Realized Gain (Loss) | $ (237) | $ (170) | $ 77 |
| X | ||||||||||
|
- Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|