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Leases - Lease Balances within the Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Operating lease right-of-use assets $ 19,522 $ 19,826
Liabilities:    
Other accrued liabilities 6,094 4,903
Long-term operating lease obligations 13,681 15,639
Total lease liabilities $ 19,775 $ 20,542