Leases (Schedule of Lease Costs) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease, Cost [Abstract]
Operating lease costs	$ 8,091	$ 24,333
Short-term lease costs	184	660
Variable lease costs	1	(2)
Sublease income	(625)	(2,027)
Net lease costs	$ 7,651	$ 22,964