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Leases Leases (Tables)
 9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Lease, Cost [Table Text Block] Lease costs represent the straight-line lease expense of ROU assets and short-term leases. The components of lease cost are classified as follows (in thousands):
Three Months Ended September 30, 2021Three Months Ended September 30, 2020Nine Months Ended September 30, 2021Nine Months Ended September 30, 2020
Lease Costs Included in the Asset Additions in the Condensed Consolidated Balance Sheets
Property, plant and equipment acquisitions - short-term leases$1,189 $— $3,009 $2,302 
Property, plant and equipment acquisitions - operating leases— — — 10 
Total lease costs in property, plant and equipment additions$1,189 $— $3,009 $2,312 

Three Months Ended September 30, 2021Three Months Ended September 30, 2020Nine Months Ended September 30, 2021Nine Months Ended September 30, 2020
Lease Costs Included in the Condensed Consolidated Statements of Operations
Lease operating expenses - short-term leases$314 $124 $1,399 $575 
Lease operating expenses - operating leases1,504 1,397 3,774 4,267 
General and administrative, net - operating leases303 172 653 532 
Total lease cost expensed$2,121 $1,693 $5,826 $5,374 
Lessee, Operating Lease, Disclosure [Table Text Block]
The lease term and the discount rate related to the Company's leases are as follows:
September 30, 2021
Weighted-average remaining lease term (in years)3.2
Weighted-average discount rate4.1 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
As of September 30, 2021, the Company's future undiscounted cash payment obligation for its operating lease liabilities are as follows (in thousands):
As of September 30, 2021
2021 (Remaining)$1,791 
20226,767 
20235,938 
2024776 
2025776 
Thereafter1,176 
Total undiscounted lease payments17,224 
Present value adjustment(1,209)
Net operating lease liabilities$16,015 
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Supplemental cash flow information related to leases was as follows (in thousands):
Nine Months Ended September 30, 2021Nine Months Ended September 30, 2020
Cash paid for amounts included in the measurement of lease liabilities;
Operating cash flows from operating leases$4,289 $4,793 
Investing cash flows from operating leases$— $10