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Recently Issued Accounting Standards - Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Prepaid expenses $ 1,702 $ 1,919
Operating lease right-of-use assets 20,256 21,201
Assets 1,169,003 1,145,825
Other long-term liabilities 3,162 4,748
Current portion of operating lease obligations 2,018 2,082
Obligations under operating leases, net of current portion 19,420 20,302
Liabilities $ 936,132 $ 905,323