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Supplemental Disclosures of Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]      
Cash paid for interest $ 1,660 $ 251 $ 3,369
Cash paid for taxes 666 7,664 933
Non-cash investing activities:      
Contingent consideration 9,200 0 0
Asset retirement obligation 7,546 7,084 (188)
Non-cash financing activities:      
Equipment purchased with debt 4,733 0 0
Leasehold improvements funded by landlord 0 787 0
Write-off of remaining balance of returned equipment under capital lease 398 0 0
Capitalized non-cash interest into property, plant and equipment 0 0 139
Capitalized expenditures in accounts payable and accrued expenses $ 3,014 $ 17,477 $ 48