Concentration of Risk (Details) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 |
Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Sales Revenue Net [Member] | Accounts Receivable [Member] | Accounts Receivable [Member] | Accounts Receivable [Member] | Accounts Receivable [Member] | Accounts Receivable [Member] | Accounts Receivable [Member] | Accounts Receivable [Member] | Accounts Receivable [Member] |
Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Customer Concentration Risk [Member] | Credit Concentration Risk [Member] | Credit Concentration Risk [Member] | Credit Concentration Risk [Member] | Credit Concentration Risk [Member] | Credit Concentration Risk [Member] | Credit Concentration Risk [Member] | Credit Concentration Risk [Member] | Credit Concentration Risk [Member] |
item | item | item | item | Largest Customer [Member] | Largest Customer [Member] | Largest Customer [Member] | Largest Customer [Member] | Second Largest Customer [Member] | Second Largest Customer [Member] | Second Largest Customer [Member] | Third Largest Customer [Member] | item | item | Largest Customer [Member] | Largest Customer [Member] | Second Largest Customer [Member] | Second Largest Customer [Member] | Third Largest Customer [Member] | Third Largest Customer [Member] |
Concentration of risk | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of customers | 2 | 3 | 2 | 1 | ' | ' | ' | ' | ' | ' | ' | ' | 3 | 3 | ' | ' | ' | ' | ' | ' |
Percentage of concentration risk | ' | ' | ' | ' | 15.90% | 15.10% | 24.50% | 10.60% | 11.10% | 14.70% | 12.50% | 10.60% | ' | ' | 15.00% | 23.20% | 13.40% | 14.20% | 12.70% | 13.60% |