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- Carrying Values of Leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease right-of-use assets $ 23,485 $ 16,470 $ 0
Finance lease right-of-use assets 5,500    
Total right-of-use assets 29,000    
Operating 1,541 2,633 0
Current portion of finance lease obligations 284   312
Total current lease liabilities 1,800    
Obligations under operating leases, net of current portion 22,673 $ 14,655 $ 0
Finance 6,000    
Total non-current lease liabilities 28,700    
Total lease liabilities 30,500    
Finance lease, accumulated amortization $ 1,700