Leases (Schedule of Components of Lease Expense and Supplemental Cash Flow Information for Leases) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 1,072	$ 3,172
Short-term lease cost	30	121
Variable lease cost	175	420
Sublease income	(172)	(515)
Total lease cost	$ 1,105	3,198
Cash paid for operating leases included in operating activities		3,057
Right-of-use assets obtained in exchange for operating lease liabilities		$ 23,886