Leases - Components of Lease Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Finance lease cost:
Amortization of right-of-use assets	$ 4,495
Interest on lease liabilities	529
Operating lease cost:
Lease expense	1,838
Short-term lease cost	1,787
Total lease cost	8,649
Variable lease cost	$ 284