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Shareholders' Equity (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 25, 2018
Equity, Class of Treasury Stock [Line Items]    
Stock repurchase program, authorized amount $ 2,400,000  
Value of common shares remaining to be repurchased $ 50,243  
Repurchases in Accordance with Stock Award Agreements [Member]    
Equity, Class of Treasury Stock [Line Items]    
Acquisition of treasury stock (shares), total 12  
Acquisition of treasury stock (value), total $ 3,988  
Subsequent Event [Member]    
Equity, Class of Treasury Stock [Line Items]    
Stock repurchase program, additional authorized amount   $ 100,000