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Related Parties (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transactions [Abstract]          
Sales to affiliates $ 447 $ 466 $ 592 $ 1,150  
Payments to affiliates 101 $ 305 111 $ 308  
Due from affiliates 138   138   $ 9
Due to affiliates $ 12   $ 12   $ 0