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Stock-Based Compensation (Activity Pertaining To Restricted Stock Awards) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 900,286 776,743 589,527
Weighted average price, beginning balance $ 50.81 $ 48.70 $ 48.11
Number of shares, granted 724,442 455,122 453,549
Weighted average price, granted $ 34.06 $ 53.72 $ 48.20
Number of shares, vested (382,902) (304,804) (248,003)
Weighted average price, exercised $ 49.69 $ 49.68 $ 46.46
Number of shares, forfeited (28,004) (26,775) (18,330)
Weighted average price, forfeited $ 45.33 $ 51.92 $ 47.85
Number of shares, ending balance 1,213,822 900,286 776,743
Weighted average price, ending balance $ 41.29 $ 50.81 $ 48.70
Non-employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 35,136 35,704 24,606
Weighted average price, beginning balance $ 50.08 $ 41.07 $ 40.23
Number of shares, granted 25,848 13,768 21,128
Weighted average price, granted $ 34.04 $ 63.91 $ 41.65
Number of shares, vested (18,920) (14,336) (10,030)
Weighted average price, exercised $ 46.51 $ 40.93 $ 40.23
Number of shares, forfeited 0 0 0
Weighted average price, forfeited $ 0.00 $ 0.00 $ 0.00
Number of shares, ending balance 42,064 35,136 35,704
Weighted average price, ending balance $ 41.83 $ 50.08 $ 41.07
Time Vested | Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 724,766 652,835 523,024
Number of shares, granted 576,361 383,448 396,144
Number of shares, vested (343,657) (291,712) (248,003)
Number of shares, forfeited (20,808) (19,805) (18,330)
Number of shares, ending balance 936,662 724,766 652,835
Performance Shares | Restricted Stock - Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 175,520 123,908 66,503
Number of shares, granted 148,081 71,674 57,405
Number of shares, vested (39,245) (13,092) 0
Number of shares, forfeited (7,196) (6,970) 0
Number of shares, ending balance 277,160 175,520 123,908