Leases - Supplemental balance sheet information (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating right-of-use assets	$ 20,054
Finance lease assets	7,900
Total lease assets	27,954
Operating lease liabilities, current	7,837
Finance lease liabilities, current	2,626
Operating lease liabilities, noncurrent	18,021
Finance lease liabilities, noncurrent	5,247
Total lease liabilities	33,731
Finance lease ROU assets accumulated amortization	$ 1,200