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Summary of Significant Accounting Policies (Fair Value Measurement) (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Accounting Policies [Abstract] | ||
| Transfers between Level 2 and Level 3 | $ 15,001 | |
| Transfers between Level 3 into Level 2 | $ 43,512 | |