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Concentration of Credit Risk and Trade Accounts Receivable (Details)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Revenue, Major Customer | |||
| Entity-wide revenue by major customer, percentage | 100.00% | 100.00% | 100.00% |
| Customer A [Member] | |||
| Revenue, Major Customer | |||
| Entity-wide revenue by major customer, percentage | 22.00% | 28.00% | 30.00% |
| Customer B [Member] | |||
| Revenue, Major Customer | |||
| Entity-wide revenue by major customer, percentage | 0.00% | 13.00% | 0.00% |
| Cusotmer C [Member] | |||
| Revenue, Major Customer | |||
| Entity-wide revenue by major customer, percentage | 12.00% | 12.00% | 13.00% |
| Customer D [Member] | |||
| Revenue, Major Customer | |||
| Entity-wide revenue by major customer, percentage | 10.00% | 10.00% | 14.00% |
| Customer Other [Member] | |||
| Revenue, Major Customer | |||
| Entity-wide revenue by major customer, percentage | 56.00% | 37.00% | 43.00% |