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Revenue From Contracts with Customers - Contract Balances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disaggregation of Revenue      
Accounts receivable, trade $ 147,985 $ 121,299 $ 113,416
Contract with customer 17,100 9,000  
Increase in contract liability from freight billing and after market services 36,600    
Revenue from contract liability 28,400    
Trade receivable      
Disaggregation of Revenue      
Accounts receivable, trade $ 142,100 $ 115,600