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Summary of Significant Accounting Policies Allowance for Doubtful Accounts (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Allowance for Doubtful Accounts Receivable [Roll Forward] | |||
| Allowance for Doubtful Accounts Receivable | $ 170 | $ 0 | $ 0 |
| Provision for Doubtful Accounts | 0 | 170 | 0 |
| Allowance for Doubtful Accounts Receivable, Charge-offs | (170) | 0 | 0 |
| Allowance for Doubtful Accounts Receivable | $ 0 | $ 170 | $ 0 |