Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease expense	$ 3,241	$ 3,704
Short-term lease expense	6,457	9,010
Total lease expense	$ 9,698	$ 12,714