Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finance leases:
Amortization expense	$ 371	$ 310
Interest on lease liabilities	52	4
Operating leases	4,284	3,693
Short-term leases	6,703	4,571
Variable lease expense	408	219
Sublease Income	(50)	(49)
Total lease expense from continuing operations	$ 11,768	$ 8,748