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Commitments and contingencies (Tables)
9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Finance Lease, Liability, Fiscal Year Maturity The future minimum payments of finance lease obligations are as follows:
(in thousands)
Remainder of 2021$6,846 
202225,050 
202311,125 
20246,951 
20254,870 
Thereafter1,721 
Future minimum lease payments56,563 
Less: Amount representing interest(3,713)
Present value of minimum lease payments52,850 
Less: Current portion of finance lease obligations24,724 
Finance lease obligations, less current portion$28,126 
Lessee, Operating Lease, Liability, Maturity The future minimum payments under non-cancelable operating leases are as follows:
(in thousands)
Remainder of 2021$3,247 
202211,983 
20239,476 
20245,058 
20252,285 
Thereafter18,960 
Future minimum lease payments51,009 
Less: Amount representing interest(12,481)
Present value of minimum lease payments38,528 
Less: Current portion of operating lease obligations10,196 
Operating lease obligations, less current portion$28,332 
Schedule of Additional Lease Information
Lease Information
Three months endedNine Months Ended
September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Finance Lease cost:
   Amortization of right-of-use assets$5,855 $5,281 $17,533 $16,836 
   Interest on lease liabilities758 891 2,364 3,017 
Operating lease cost3,186 3,340 9,759 10,307 
Short-term lease cost61,222 49,817 120,450 116,585 
Variable lease cost2,214 891 6,372 2,835 
Sublease Income(33)(33)(100)(99)
Total lease cost$73,202 $60,187 $156,378 $149,481 
Other information:
Cash paid for amounts included in the measurement of lease liabilities:
   Operating cash flows from finance leases$758 $891 $2,363 $3,017 
   Operating cash flows from operating leases$3,232 $3,275 $9,656 $10,003 
Weighted-average remaining lease term - finance leases2.84 years2.55 years
Weighted-average remaining lease term - operating leases7.55 years8.16 years
Weighted-average discount rate - finance leases5.49 %6.07 %
Weighted-average discount rate - operating leases6.75 %6.94 %