XML 81 R68.htm IDEA: XBRL DOCUMENT v3.8.0.1
Related Parties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transactions [Abstract]      
Sales to affiliates $ 1,579 $ 1,671 $ 1,532
Payments to affiliates 432 697 $ 841
Due from affiliates 9 10  
Due to affiliates $ 0 $ 0