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Other Current and Long-Term Assets (Schedule Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Other Current and Long-Term Assets [Abstract]    
Prepaid expenses $ 25,330 $ 25,746
Taxes receivable 20,217 27,672
Customer acquisition costs, net 19,364 18,085
Other assets 15,800 19,703
Other current assets $ 80,711 $ 91,206