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Leases - Lease assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]      
Right-of-use assets $ 51,471 $ 128,192 $ 46,600
Other current liabilities 9,623 15,051  
Operating lease liabilities $ 42,097 $ 113,648  
Weighted Average Remaining Lease Term 7 years 7 months 20 days 12 years 7 months 2 days  
Weighted Average Discount Rate 5.96% 5.19%  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent