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Other Current and Long-Term Assets (Schedule Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Other Assets, Noncurrent [Abstract]    
Prepaid expenses $ 27,250 $ 28,967
Taxes receivable 41,315 35,475
Customer acquisition costs (Notes 2 and 3) 32,303 23,520
Contract assets (Notes 2 and 3) 6,558 0
Deferred sales commissions (Notes 2 and 3) 4,440 0
Other assets (Notes 2 and 3) 11,908 13,178
Other current assets $ 123,774 $ 101,140