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Leases - Lease Balances within the Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets:    
Operating lease right-of-use assets $ 21,315  
Liabilities:    
Other accrued liabilities 3,762 $ 0
Long-term operating lease obligations 17,520  
Total lease liabilities $ 21,282