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Recently Issued Accounting Standards - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Prepaid expenses $ 1,913 $ 1,919
Operating lease right-of-use assets 20,747 21,201
Assets 1,157,726 1,145,825
Other long-term liabilities 2,677 4,748
Current portion of operating lease obligations 2,057 2,082
Obligations under operating leases, net of current portion 19,876 20,302
Liabilities $ 906,223 $ 905,323