Other Current and Noncurrent Assets (Schedule Of Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Current and Noncurrent Assets [Abstract]
Prepaid expenses	$ 25,746	$ 27,244
Taxes receivable	27,672	11,792
Customer acquisition costs, net	18,085	16,412
Other assets	19,703	6,621
Total other current assets	$ 91,206	$ 62,069