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Leases - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Assets:    
Operating lease right-of-use assets $ 26,361  
Liabilities:    
Current 5,241  
Long-term 22,418  
Total operating lease liabilities $ 27,659  
Accounting Standards Update 2016-02    
Assets:    
Operating lease right-of-use assets   $ 23,143
Liabilities:    
Current   4,426
Long-term   19,566
Total operating lease liabilities   $ 23,992