Other Current and Long-Term Assets (Schedule Of Other Current Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Other Current and Long-Term Assets [Abstract]
Prepaid expenses	$ 23,362	$ 27,244
Taxes receivable	12,859	11,792
Customer acquisition costs, net	17,202	16,412
Other assets	10,034	6,621
Other current assets	$ 63,457	$ 62,069