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Shared-based Compensation (Summary Of Restricted Stock Units and Performance Stock Units Activity) (Details) - Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares      
Outstanding, Beginning Balance 1,806,853 1,654,753 2,262,428
Granted 1,582,429 927,214 609,357
Forfeited (975,994) (251,351) (374,463)
Vested (728,228) (523,763) (842,569)
Outstanding, Ending Balance 1,685,060 1,806,853 1,654,753
Vested and expected to vest, end of period, Number of Shares 1,524,287    
Aggregate Intrinsic Value      
Outstanding, end of period $ 27,230,570    
Vested and expected to vest $ 24,632,473