Leases Components of Lease Expense and Supplementary Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating lease expense	$ 2,609	$ 0
Amortization of right-of-use assets	1,237	0
Interest on lease liabilities	10	0
Total finance lease expense	1,247	0
Short-term lease expense	123	0
Total lease expense	3,979	0
Operating cash flows from operating leases	2,336	0
Operating cash flows from finance leases	10	0
Financing cash flows from finance leases	$ 51	$ 0	$ 0