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Shareholders' Equity (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
 6 Months Ended 105 Months Ended
Jun. 30, 2017
Jun. 30, 2017
May 23, 2017
Shareholders’ Equity [Abstract]      
Stock repurchase program, additional authorized amount     $ 100,000
Stock repurchase program, authorized amount $ 2,300,000 $ 2,300,000  
Acquisition of treasury stock (shares) 244 7,107  
Acquisition of treasury stock (value), total $ 104,648 $ 2,102,457  
Value of common shares remaining to be repurchased $ 197,927 $ 197,927