Other Current and Long-Term Assets (Schedule Of Other Current Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Current and Long-Term Assets [Abstract]
Prepaid expenses	$ 26,323	$ 25,746
Taxes receivable	25,581	27,672
Customer acquisition costs, net	20,870	18,085
Other assets	13,031	19,703
Other current assets	$ 85,805	$ 91,206