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Summary of Significant Accounting Policies - Inventory (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Inventory, net    
Raw materials $ 133,563 $ 130,414
Work-in-progress 7,777 5,498
Finished goods 25,197 40,429
Total inventory $ 166,537 $ 176,341
2018 Revolving Credit Facility    
Long-term Debt, Unclassified [Abstract]    
Debt Instrument Covenant, Net Debt To E B I T D A, Threshold Multiplier Of E B I T D A 5.5