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Shareholders' Equity (Narrative) (Details)
shares in Thousands, $ in Thousands
9 Months Ended 84 Months Ended
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2015
USD ($)
shares
Shareholders’ Equity [Abstract]    
Acquisition of treasury stock (shares) | shares 230 4,443
Acquisition of treasury stock (value), total $ 147,110 $ 845,196
Value of common shares remaining to be repurchased $ 155,107 $ 155,107