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Shareholders' Equity (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
 6 Months Ended 81 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jul. 21, 2015
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, authorized amount $ 900,000 $ 900,000  
Acquisition of treasury stock (shares) 184 4,397  
Acquisition of treasury stock (value), total $ 116,310 $ 814,396  
Value of common shares remaining to be repurchased $ 85,906 $ 85,906  
Subsequent Event [Member]      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, additional authorized amount     $ 100,000