Leases - Supplemental cash flow (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 658
Operating cash flows from operating leases	5,074
Financing cash flows from finance leases	5,660
Total	11,392
Right-of-use assets obtained for new lease obligations:
Operating leases	6,251
Finance leases	2,921
Total	$ 9,172