Accounts Receivable (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 63,072	$ 55,220
Less allowance for doubtful accounts	(987)	(767)
Accounts receivable, net	62,085	54,453
Trade Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	38,429	35,762
Unpaid Amounts For Benefit Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 24,643	$ 19,458