Quarterly report pursuant to Section 13 or 15(d)

General (Details)

v3.10.0.1
General (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue from External Customer [Line Items]        
Amounts due from contracts with customers recognized $ 813 $ 0 $ 7,614 $ 0
Accounts Receivable        
Revenue from External Customer [Line Items]        
Amounts due from contracts with customers recognized     $ 0