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Supplemental Disclosures of Cash Flow Information
 12 Months Ended
Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]  
Supplemental Disclosures of Cash Flow Information Supplemental Disclosures of Cash Flow information
Supplemental disclosures regarding cash flow information and non-cash investing and financing activities are as follows:
Year Ended December 31,
201920182017
Cash paid for interest$2,833  $1,660  $251  
Cash paid for taxes$207  $666  $7,664  
Non-cash investing activities:
Contingent consideration$—  $9,200  $—  
Asset retirement obligation$(5,114) $7,546  $7,084  
Non-cash financing activities:
Equipment purchased with debt$—  $4,733  $—  
Leasehold improvements funded by landlord$—  $—  $787  
Write-off of remaining balance of returned equipment under capital lease
$—  $398  $—  
Capitalized expenditures in accounts payable and accrued expenses$899  $3,014  $17,477