Leases - Supplemental cash flow (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 203
Operating cash flows from operating leases	1,710
Financing cash flows from finance leases	1,846
Total	3,759
Right-of-use assets obtained for new lease obligations:
Operating leases	1,407
Finance leases	216
Total	$ 1,623