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Stockholders' Equity (Schedule Of Activity Of Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted Stock Units, Outstanding at beginning of period 1,644,754  
Restricted Stock Units, Granted 705,538  
Restricted Stock Units, Vested (886,655)  
Restricted Stock Units, Expired / cancelled (22,459)  
Restricted Stock Units, Forfeited (898)  
Restricted Stock Units, Outstanding at end of period 1,440,280 1,644,754
Weighted Average Grant-Date Fair Value, Outstanding at beginning of period $ 62.90  
Weighted Average Grant-Date Fair Value, Granted 98.42  
Weighted Average Grant-Date Fair Value, Vested 57.32  
Weighted Average Grant-Date Fair Value, Expired / cancelled 63.60  
Weighted Average Grant-Date Fair Value, Forfeited 63.60  
Weighted Average Grant-Date Fair Value, Outstanding at end of period $ 75.80 $ 62.90
Weighted Average Remaining Contractual Term in Years, Outstanding 2 years 1 month 6 days 1 year 7 months 6 days