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Summary of Significant Accounting Policies (Details 2) | 12 Months Ended
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Dec. 31, 2012 item | Dec. 31, 2011 item | Dec. 31, 2010 item
Total revenues | Customer concentration risk | One customer |  |  |
Concentration of risk |  |  |
Number of customers | 1 | 1 | 1
Percentage of concentration risk | 18.20% | 21.20% | 18.60%
Total revenues | Customer concentration risk | Ten largest customers |  |  |
Concentration of risk |  |  |
Number of customers | 10 |  |
Percentage of concentration risk | 70.60% | 68.60% | 62.70%
Consolidated accounts receivable | Credit concentration risk |  |  |
Concentration of risk |  |  |
Number of customers | 2 |  |
Consolidated accounts receivable | Credit concentration risk | One customer |  |  |
Concentration of risk |  |  |
Number of customers | 1 | 1 |
Percentage of concentration risk | 11.90% | 27.20% |
Consolidated accounts receivable | Credit concentration risk | Second customer |  |  |
Concentration of risk |  |  |
Number of customers | 1 |  |
Percentage of concentration risk | 11.50% |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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