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Common Shares And Stock-Based Awards Plans (Tables)
12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Stock Options
       Weighted-   
     Weighted- Average   
     Average Remaining  Aggregate
  Number of  Exercise Contractual  Intrinsic
(in thousands, except per share data) Options  Price Term (Years)  Value
Outstanding at December 31, 2011  4,525 $ 19.69     
Granted  432   15.77     
Exercised  (375)   12.42     
Forfeited or expired  (342)   20.42     
Outstanding at December 31, 2012  4,240   19.88     
Granted  348   17.37     
Exercised  (713)   15.72     
Forfeited or expired  (791)   22.88     
Outstanding at December 31, 2013  3,084   19.79     
Granted  378   22.94     
Exercised  (940)   20.06     
Forfeited or expired  (85)   22.61     
Outstanding at December 31, 2014  2,437 $ 20.07  5.04 $ 13,617
           
Exercisable at December 31, 2014  1,616 $ 20.32  3.13 $ 8,819
Restricted Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Stock-Based Awards

The following table summarizes the activities related to the Company's restricted shares:

    Weighted-
    Average
  Number of Grant Date
(in thousands, except per share data) Shares Fair Value
Non-vested shares outstanding at December 31, 2011  244$ 18.23
Granted  209  15.56
Vested  (87)  17.57
Forfeited  (26)  17.49
Non-vested shares outstanding at December 31, 2012  340  16.81
Vested  (106)  17.42
Forfeited  (40)  16.40
Non-vested shares outstanding at December 31, 2013  194  16.56
Vested  (76)  16.87
Forfeited  (9)  16.85
Non-vested shares outstanding at December 31, 2014  109$ 16.33
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Stock-Based Awards

The following table summarizes the activities related to the Company's time-based restrictive stock units:

    Weighted-
    Average
  Number of Grant Date
(in thousands, except per share data) Units Fair Value
Non-vested awards outstanding at December 31, 2011  83$ 17.88
Granted  95  15.50
Vested  (61)  16.35
Forfeited  (14)  17.07
Non-vested awards outstanding at December 31, 2012  103  16.70
Granted  277  17.66
Vested  (67)  17.06
Forfeited  (10)  17.36
Non-vested awards outstanding at December 31, 2013  303  17.48
Granted  246  22.92
Vested  (112)  18.34
Forfeited  (25)  19.99
Non-vested awards outstanding at December 31, 2014  412$ 20.33
Performance-Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Stock-Based Awards

The following table summarizes the activities related to the Company's performance-based restricted stock units:

    Weighted-
    Average
  Number of Grant Date
(in thousands, except per share data) Units Fair Value
Non-vested awards outstanding at December 31, 2011  68$ 18.57
Granted(1)  103  15.11
Forfeited  (7)  18.57
Non-vested awards outstanding at December 31, 2012  164  16.39
Granted(1)  76  17.37
Forfeited  (25)  16.03
Non-vested awards outstanding at December 31, 2013  215  16.78
Granted(1)  88  22.92
Forfeited  (29)  18.52
Non-vested awards outstanding at December 31, 2014  274$ 18.56
     

(1) Represents target number of units that can vest based on the achievement of the performance goals.