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Commitments, contingencies and guarantees (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Components of Lease Expense [Text Block]
The components of net lease cost, which were recorded in operating expenses, were as follows:
Year ended December 31,
(in thousands)
2020 (1)
2019 (1)
2018 (2)
Operating lease cost (1)
$14,815 $17,811 $13,649 
Sublease income(526)(656)(765)
Right-of-use asset impairment cost12,460 — — 
Net lease cost$26,749 $17,155 $12,884 
(1)    Operating lease cost includes variable lease costs, which are immaterial.
(2)    Represents rent expense and sublease income under ASC 840, Leases.
Schedule of Supplemental Cash Flow Information Related To Leases [Text Block]
Supplemental cash flow information related to leases was as follows:
Year ended December 31,
(in thousands)20202019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases$14,310 $14,015 
Right-of-use assets obtained in exchange for operating lease liabilities1,343 13,287 
Operating lease modifications to decrease right-of-use assets(2,251)— 

Supplemental balance sheet information related to leases was as follows:
December 31, 2020December 31, 2019
Weighted-average remaining lease term (in years) - operating leases5.536.44
Weighted-average discount rate - operating leases6.2%6.2%
Schedule of Maturities of Lease Liabilities [Text Block]
As of December 31, 2020, maturities of operating lease liabilities were as follows:
(in thousands)
December 31, 2020
2021$12,794 
202212,945 
202311,924 
202411,519 
202511,306 
Thereafter12,626 
Total lease payments
73,114 
Less: Imputed interest
(12,112)
Present value of lease liabilities
$61,002