Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 19,059	$ 20,900	$ 0
Leases not yet commenced	25,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	(1,800)
Increase in Operating leases due to new leases	2,100
Operating Lease, Cost	3,900
Operating lease liabilities	$ 19,059	$ 20,889	$ 0