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Investments (Details) (USD $)
In Thousands, unless otherwise specified |
1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
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Jan. 31, 2010
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Investments (Textual) [Abstract] | ||||
| Long-term restricted investments | $ 3,999 | $ 3,973 | ||
| Proceeds from sale of restricted investments | 0 | 250 | 0 | |
| New letter of credit agreement | 26 | 826 | 0 | |
| Sale of auction rate of securities | 9,456 | |||
| Gain on sale of auction rate securities | $ 425 | |||
| X | ||||||||||
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- Definition
Gain on sale of auction rate securities. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow associated with the sale of investments that are pledged or subject to withdrawal restrictions during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. No definition available.
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