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Stock-Based Compensation (Activity Pertaining To Restricted Stock Awards) (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 1,213,822 900,286 776,743
Weighted average price, beginning balance $ 41.29 $ 50.81 $ 48.70
Number of shares, granted 646,451 724,442 455,122
Weighted average price, granted $ 5.62 $ 34.06 $ 53.72
Number of shares, vested (425,195) (382,902) (304,804)
Weighted average price, exercised $ 43.47 $ 49.69 $ 49.68
Number of shares, forfeited (133,213) (28,004) (26,775)
Weighted average price, forfeited $ 36.87 $ 45.33 $ 51.92
Number of shares, ending balance 1,301,865 1,213,822 900,286
Weighted average price, ending balance $ 23.32 $ 41.29 $ 50.81
Non-employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 42,064 35,136 35,704
Weighted average price, beginning balance $ 41.83 $ 50.08 $ 41.07
Number of shares, granted 90,000 25,848 13,768
Weighted average price, granted $ 12.02 $ 34.04 $ 63.91
Number of shares, vested (20,248) (18,920) (14,336)
Weighted average price, exercised $ 43.46 $ 46.51 $ 40.93
Number of shares, forfeited 0 0 0
Weighted average price, forfeited $ 0.00 $ 0.00 $ 0.00
Number of shares, ending balance 111,816 42,064 35,136
Weighted average price, ending balance $ 17.21 $ 41.83 $ 50.08
Time Vested | Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 936,662 724,766 652,835
Number of shares, granted 494,078 576,361 383,448
Number of shares, vested (425,195) (343,657) (291,712)
Number of shares, forfeited (75,808) (20,808) (19,805)
Number of shares, ending balance 929,737 936,662 724,766
Performance Shares | Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 277,160 175,520 123,908
Number of shares, granted 152,373 148,081 71,674
Number of shares, vested 0 (39,245) (13,092)
Number of shares, forfeited (57,405) (7,196) (6,970)
Number of shares, ending balance 372,128 277,160 175,520