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Shareholders' Equity (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 102 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Jan. 10, 2017
Shareholders’ Equity [Abstract]      
Stock repurchase program, additional authorized amount     $ 100,000
Stock repurchase program, authorized amount $ 2,200,000 $ 2,200,000  
Acquisition of treasury stock (shares) 141 7,004  
Acquisition of treasury stock (value), total $ 57,959 $ 2,055,767  
Value of common shares remaining to be repurchased $ 144,613 $ 144,613