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Stock-Based Compensation (Schedule Of Shares And Units Of Restricted Common Stock) (Details) - Restricted Stock Awards [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding at beginning of period — unvested 2,942 2,806 2,523
Granted, Number of Shares/Units 2,516 1,438 1,031
Cancelled, Number of Shares/Units (526) (672) (85)
Vested, Number of Shares/Units (1,151) (630) (663)
Outstanding at end of period — unvested 3,781 2,942 2,806
Outstanding at beginning of period — unvested, Weighted Average Grant Date Fair Value $ 36.55 $ 41.08 $ 41.21
Granted, Weighted Average Grant Date Fair Value 11.57 16.12 49.46
Cancelled, Weighted Average Grant Date Fair Value 38.64 46.20 39.52
Vested, Weighted Average Grant Date Fair Value 40.99 23.89 12.59
Outstanding at end of period — unvested, Weighted Average Grant Date Fair Value $ 36.34 $ 36.55 $ 41.08