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Share-Based Compensation and Equity (Textuals) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
shares
$ / shares
Dec. 31, 2013
USD ($)
$ / shares
Dec. 31, 2012
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividends, per share, cash paid $ 1.15 $ 1.15 $ 1.14
Number of Shares Authorized | shares 9,126,005    
Number of Shares Available for Grant | shares 5,532,005    
Aggregate intrinsic value of options exercised | $ $ 2,149 $ 2,083 $ 4,393
Weighted-average grant-date fair value of stock options granted $ 6.75 $ 7.79 $ 10.43
Total fair value of stock options vested | $ $ 1,769 $ 8,043 $ 3,413
Issuance of common shares | $ $ 14,607 $ 16,723 $ 16,679
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion to common stock (shares) | shares 1    
Granted, Weighted-average grant-date fair value $ 35.25 [1] $ 30.14 $ 35.16
Total fair value of deferred shares vested | $ $ 4,394 $ 9,176 $ 4,202
Restricted Stock Units [Member] | One year vest [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Granted, Weighted-average grant-date fair value $ 39.35    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion to common stock (shares) | shares 1    
Granted, Weighted-average grant-date fair value $ 38.07 [2] $ 29.15 $ 44.25
Total fair value of deferred shares vested | $ $ 0 $ 1,090 $ 2,521
Performance Shares [Member] | Three year graded vest [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Granted, Weighted-average grant-date fair value $ 35.49    
Minimum | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Minimum | Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Maximum | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Maximum | Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 7 years    
[1] The RSUs granted during the year ended December 31, 2014 include 35 thousand one-year RSUs to non-employee directors under the 1991 Plan. These RSUs have a weighted-average grant-date fair value of $39.35
[2] The maximum performance shares granted during the year ended December 31, 2014 include 439 thousand shares that vest proportionately over a three-year period and have a weighted-average grant-date fair value of $35.49.