Commitments and Contingencies - Lease Costs and Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 1,285	$ 2,998
Variable lease cost	301	1,758
Short-term lease cost	12,321	67,123
Operating cash flows from operating leases	1,262	1,123
Investing cash flows from operating leases	$ 0	$ 1,791