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Acquisition of Clearwater - Preliminary Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Oct. 05, 2018
Business Acquisition [Line Items]      
Goodwill $ 29,518 $ 29,518  
Clearwater      
Business Acquisition [Line Items]      
Accounts receivable     $ 1,897
Intangibles     799
Property, plant and equipment     37,589
Goodwill     2,379
Accounts payable and accrued expenses     (372)
Total     $ 42,292