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7. Leases (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Leases [Abstract]    
Operating lease cost $ 4,392  
Amortization of right-of-use assets (392) $ 0
Interest on lease liability 0  
Variable lease cost 0  
Total operating lease cost 4,000  
Cash paid for amounts included in the measurement of lease liabilities 433  
Operating cash flows from operating leases 0  
Right-of-use assets obtained in exchange for new finance operating liabilities $ 0  
Weighted-average remaining lease term - operating leases 4 years 2 months 1 day  
Weighted-average discount rate - operating leases 2.90%