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Supplemental Disclosures of Cash Flow Information
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
 
2016
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

 
$
—

 
$
—

Asset retirement obligation
$
7,546

 
$
7,084

 
$
(188
)
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 non-cash interest into property, plant and equipment
$
—

 
$
—

 
$
139

Capitalized expenditures in accounts payable and accrued expenses
$
3,014

 
$
17,477

 
$
48