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Consolidated balance sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Aug. 14, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]            
Accounts and notes receivable, allowance for doubtful accounts $ 1,406 $ 1,097 $ 326 $ 244 $ 5,877 $ 6,969
Common stock, par value $ 0.01 $ 0.01 $ 0.01      
Common stock, shares authorized 3,000,000,000 3,000,000,000 3,000,000,000      
Common stock, shares issued 302,225,923 302,225,923 302,225,923