Concentration of Credit Risk and Major Customers (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013 customer	Dec. 31, 2012 customer	Dec. 31, 2011 customer
Accounts Receivable | Credit Concentration Risk
Revenue, Major Customer [Line Items]
Number of customers considered to give rise to concentration risk	2	2
Net Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Number of customers considered to give rise to concentration risk	3	2	3
Customer Providing Largest Concentration of Receivable | Accounts Receivable | Credit Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of concentration risk	16.00%	21.00%
Customer Providing Second Largest Concentration of Receivable | Accounts Receivable | Credit Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of concentration risk	10.00%	16.00%
Customer Accounting for the Largest Concentration of Revenue | Net Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of concentration risk	15.00%	16.00%	17.00%
Customer Accounting for Second Largest Concentration of Revenue | Net Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of concentration risk	14.00%	11.00%	11.00%
Customer Accounting for Third Largest Concentraion | Net Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of concentration risk	11.00%		10.00%