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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lease Costs [Table Text Block] The components of lease expense were as follows:
Year Ended December 31
20202019
(thousands)
Operating lease cost$13,339 $13,541 
Finance lease cost
Amortization of right-of-use assets2,210 1,616 
Interest on lease liabilities2,271 1,899 
Variable lease cost2,967 2,645 
Short-term lease cost4,115 4,614 
Sublease income(140)(540)
Total lease cost$24,762 $23,775 
Lease Supplemental Cash Flow [Table Text Block] Supplemental cash flow information related to leases was as follows:
Year Ended December 31
20202019
(thousands)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases$13,018 $13,508 
Operating cash flows from finance leases2,271 1,862 
Financing cash flows from finance leases1,307 783 
Right-of-use assets obtained in exchange for lease obligations
Operating leases8,310 4,211 
Finance leases9,969 2,637 
Lessee, Weighted-average Term and Discount Rate [Table Text Block] Other information related to leases was as follows:
December 31, 2020December 31, 2019
Weighted-average remaining lease term (years)
Operating leases88
Finance leases1514
Weighted-average discount rate
Operating leases (a)6.4 %6.5 %
Finance leases7.7 %8.5 %
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(a)    Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.
Minimum Lease Payment Requirements for Operating Lease Liability [Table Text Block] As of December 31, 2020, our minimum lease payment requirements for noncancelable operating and finance leases are as follows:
Operating LeasesFinance Leases
(thousands)
2021$13,593 $3,924 
202213,024 3,930 
202312,073 3,970 
202411,189 3,967 
20259,448 3,607 
Thereafter25,545 37,801 
Total future minimum lease payments84,872 57,199 
Less: interest(18,945)(24,035)
Total lease obligations65,927 33,164 
Less: current obligations(9,926)(1,557)
Long-term lease obligations$56,001 $31,607 

    As of December 31, 2020, the minimum lease payment amount for leases signed but not yet commenced was $7.3 million.
Minimum Lease Payment Requirements for Finance Lease Liability [Table Text Block] As of December 31, 2020, our minimum lease payment requirements for noncancelable operating and finance leases are as follows:
Operating LeasesFinance Leases
(thousands)
2021$13,593 $3,924 
202213,024 3,930 
202312,073 3,970 
202411,189 3,967 
20259,448 3,607 
Thereafter25,545 37,801 
Total future minimum lease payments84,872 57,199 
Less: interest(18,945)(24,035)
Total lease obligations65,927 33,164 
Less: current obligations(9,926)(1,557)
Long-term lease obligations$56,001 $31,607 

    As of December 31, 2020, the minimum lease payment amount for leases signed but not yet commenced was $7.3 million.