Accounts Payable and Accrued Expenses (Schedule Of Accounts Payable And Accrued Expenses) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Payable to benefit providers and transit agencies	$ 25,407	$ 32,469
Accounts payable and accrued liabilities	23,471	23,788
Accrued compensation and related benefits	31,282	25,921
Other accrued expenses	6,210	5,275
Deferred revenue	6,686	2,524
Accounts payable and accrued expenses	$ 93,056	$ 89,977