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Leases (Tables)
 6 Months Ended
Jun. 30, 2021
Leases [Abstract]  
Lease Costs [Table Text Block] The components of lease expense were as follows:
Three Months Ended
June 30		Six Months Ended
June 30
2021202020212020
(thousands)
Operating lease cost$3,363 $3,361 $6,725 $6,707 
Finance lease cost
Amortization of right-of-use assets598 552 1,204 999 
Interest on lease liabilities591 559 1,183 1,044 
Variable lease cost939 754 1,724 1,461 
Short-term lease cost1,165 937 2,248 2,070 
Sublease income(31)(38)(62)(77)
Total lease cost$6,625 $6,125 $13,022 $12,204 
Lease Supplemental Cash Flow [Table Text Block] Supplemental cash flow information related to leases was as follows:
Six Months Ended
June 30
20212020
(thousands)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases$6,656 $6,588 
Operating cash flows from finance leases1,177 1,044 
Financing cash flows from finance leases752 591 
Right-of-use assets obtained in exchange for lease obligations
Operating leases— 5,769 
Finance leases— 9,338 
Lease Weighted-average Term and Discount Rate [Table Text Block]
Other information related to leases was as follows:
June 30, 2021December 31, 2020
Weighted-average remaining lease term (years)
Operating leases78
Finance leases1515
Weighted-average discount rate
Operating leases6.4 %6.4 %
Finance leases7.7 %7.7 %
Minimum Lease Payment Requirements for Operating Lease Liability - Topic 842 [Table Text Block] As of June 30, 2021, our minimum lease payment requirements for noncancelable operating and finance leases are as follows:
Operating LeasesFinance Leases
(thousands)
Remainder of 2021$6,922 $1,948 
202213,007 3,879 
202312,055 3,919 
202411,171 3,916 
20259,428 3,601 
Thereafter25,545 37,801 
Total future minimum lease payments78,128 55,064 
Less: interest(17,016)(22,828)
Total lease obligations61,112 32,236 
Less: current obligations(10,145)(1,575)
Long-term lease obligations$50,967 $30,661 
Minimum Lease Payment Requirements for Finance Lease Liability - Topic 842 [Table Text Block] As of June 30, 2021, our minimum lease payment requirements for noncancelable operating and finance leases are as follows:
Operating LeasesFinance Leases
(thousands)
Remainder of 2021$6,922 $1,948 
202213,007 3,879 
202312,055 3,919 
202411,171 3,916 
20259,428 3,601 
Thereafter25,545 37,801 
Total future minimum lease payments78,128 55,064 
Less: interest(17,016)(22,828)
Total lease obligations61,112 32,236 
Less: current obligations(10,145)(1,575)
Long-term lease obligations$50,967 $30,661