Leases Leases - Lease Cost Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Lease, Cost [Abstract]
Operating Lease Term				12 months
Operating Lease, Cost	[1]	$ 638	$ 1,055	$ 1,926	$ 2,860
Finance Lease, Right-of-Use Asset, Amortization			364	650	1,083
Finance Lease, Interest Expense			11	5	42
Lease, Cost		$ 638	$ 1,430	$ 2,581	$ 3,985

[1] (1) Includes short-term leases and variable lease costs, which are immaterial