Receivables (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 104,905	$ 110,121
Less: allowance for doubtful accounts	(3,608)	(2,574)
Receivables, net	101,297	107,547
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	52,525	58,067
Unpaid amounts for benefit services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 52,380	$ 52,054