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Shareholders' Equity and Stock Options (Details)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of stock units and stock options outstanding under the Comprehensive Plan      
Stock options 1,882,939 2,600,583  
Total 3,534,652 3,965,012 4,181,214
Stock Options [Member]
     
Summary of stock units and stock options outstanding under the Comprehensive Plan      
Stock options 1,882,939 2,600,583 2,773,115
Restricted Stock Units (RSUs) [Member]
     
Summary of stock units and stock options outstanding under the Comprehensive Plan      
Restricted common stock units related to incentive compensation 1,423,611 1,135,840 1,106,166
Director [Member]
     
Summary of stock units and stock options outstanding under the Comprehensive Plan      
Common stock units related to deferred compensation 111,928 113,502 106,845
Employee [Member]
     
Summary of stock units and stock options outstanding under the Comprehensive Plan      
Common stock units related to deferred compensation 116,174 115,087 195,088