Annual report pursuant to Section 13 and 15(d)

Business Segments Information / Major Customers Revenues and Accounts Receivable by Customers (Details)

v2.4.0.8
Business Segments Information / Major Customers Revenues and Accounts Receivable by Customers (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue, Major Customer [Line Items]                      
Revenues $ 20,655 $ 21,073 $ 21,248 $ 19,496 $ 20,749 $ 20,949 $ 18,284 $ 19,461 $ 82,472 $ 79,443 $ 83,634
Customer Concentration Risk | Revenues
                     
Revenue, Major Customer [Line Items]                      
Revenues                 82,472 79,443 83,634
Customer Concentration Risk | Revenues | Customer A
                     
Revenue, Major Customer [Line Items]                      
Revenues                 9,551 8,044 13,667
Customer Concentration Risk | Current Receivables | Customer A
                     
Revenue, Major Customer [Line Items]                      
Accounts Receivable $ 348       $ 369       $ 348 $ 369 $ 430