Leases - Supplemental cash flow (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 877
Operating cash flows from operating leases	6,828
Financing cash flows from finance leases	7,484
Total	15,189
Right-of-use assets obtained for new lease obligations:
Operating leases	8,054
Finance leases	3,008
Total	$ 11,062