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- Carrying Values of Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease right-of-use assets $ 15,887 $ 16,470 $ 0
Finance lease right-of-use assets 5,600    
Total right-of-use assets 21,500    
Operating 2,653 2,633 0
Current portion of finance lease obligations 299   312
Total current lease liabilities 3,000    
Obligations under operating leases, net of current portion 13,990 $ 14,655 $ 0
Finance 6,100    
Total non-current lease liabilities 20,100    
Total lease liabilities 23,100    
Operating lease, accumulated amortization 600    
Finance lease, accumulated amortization $ 1,700