XML 76 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1
Revenue From Contracts with Customers - Narratives (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue        
Accounts and notes receivable, net of allowances $ 220,631   $ 116,841 $ 80,568
Revenue recognized $ 20,604 $ 0