Leases - Components of Lease Expense and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating Leases	$ 68	$ 205
Short-term leases	799	2,058
Total lease expense	867	2,263
Short-Term lease costs	$ 4,904	9,827
Cash paid for amounts included in the measurement of lease liabilities		205
Right-of-use assets obtained in exchange for operating lease obligations		$ 205