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Leases - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Operating lease assets $ 156,645 $ 159,777
Current operating lease liabilities 42,716 35,727
Noncurrent operating lease liabilities 161,677 176,378
Total lease liabilities $ 204,393 $ 212,105
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent