7. Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 4,392
Amortization of right-of-use assets	(199)
Interest on lease liability	0
Variable lease cost	0
Total operating lease cost	4,193
Cash paid for amounts included in the measurement of lease liabilities	214
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 5 months 1 day
Weighted-average discount rate - operating leases	2.90%