Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Long-term lease liabilities	$ 6,053		$ 6,053		$ 6,729
Operating lease, liability	4,000		4,000
Finance lease, right of use asset	2,800		2,800
Operating lease, right of use asset	2,529		2,529		$ 5,073
Operating lease, expense	1,100	$ 1,200	2,400	$ 2,400
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Operating lease, expense	200	200	400	300
Consumables
Lessee, Lease, Description [Line Items]
Operating lease, expense	$ 1,000	$ 1,000	$ 2,000	$ 2,100