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Stock-Based Compensation (Activity Pertaining To Restricted Stock Awards) (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 1,301,865 1,213,822 900,286
Weighted average price, beginning balance $ 23.32 $ 41.29 $ 50.81
Number of shares, granted 659,172 646,451 724,442
Weighted average price, granted $ 26.07 $ 5.62 $ 34.06
Number of shares, vested (517,689) (425,195) (382,902)
Weighted average price, vested $ 29.87 $ 43.47 $ 49.69
Number of shares, forfeited (79,361) (133,213) (28,004)
Weighted average price, forfeited $ 38.87 $ 36.87 $ 45.33
Number of shares, ending balance 1,363,987 1,301,865 1,213,822
Weighted average price, ending balance $ 21.25 $ 23.32 $ 41.29
Restricted Stock - Non-employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 111,816 42,064 35,136
Weighted average price, beginning balance $ 17.21 $ 41.83 $ 50.08
Number of shares, granted 49,104 90,000 25,848
Weighted average price, granted $ 17.92 $ 12.02 $ 34.04
Number of shares, vested (43,206) (20,248) (18,920)
Weighted average price, vested $ 21.24 $ 43.46 $ 46.51
Number of shares, forfeited 0 0 0
Weighted average price, forfeited $ 0.00 $ 0.00 $ 0.00
Number of shares, ending balance 117,714 111,816 42,064
Weighted average price, ending balance $ 16.03 $ 17.21 $ 41.83
Time Vested | Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 929,737 936,662 724,766
Number of shares, granted 485,799 494,078 576,361
Number of shares, vested (455,570) (425,195) (343,657)
Number of shares, forfeited (44,408) (75,808) (20,808)
Number of shares, ending balance 915,558 929,737 936,662
Performance Shares | Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 372,128 277,160 175,520
Number of shares, granted 173,373 152,373 148,081
Number of shares, vested (62,119) 0 (39,245)
Number of shares, forfeited (34,953) (57,405) (7,196)
Number of shares, ending balance 448,429 372,128 277,160