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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement Of Cash Flows [Abstract]    
Non cash retirement of assets related to lease finance obligations $ 600,000 $ 0
Non cash extinguishment of related lease finance obligation 600,000  
Equipment purchased and financed through capital lease obligations 3,100,000 1,200,000
Purchases of property, plant and equipment included in accounts payable $ 3,200,000 $ 400,000