Leases (Schedule of Components of Lease Expense and Supplemental Cash Flow Information for Leases) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 1,062	$ 2,100
Short-term lease cost	45	91
Variable lease cost	155	245
Sublease income	(182)	(343)
Total lease cost	$ 1,080	2,093
Cash paid for operating leases included in operating activities		$ 2,023