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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]            
Cash dividends declared (usd per share) $ 0.05 $ 0.05 $ 0.10 $ 0.33 $ 0.23 $ 0.15
Dividends declared       $ 117,873,000 $ 86,370,000 $ 57,530,000
Stock repurchases       442,738,000 $ 253,019,000 $ 127,661,000
Share repurchase plan [Member]            
Class of Stock [Line Items]            
Remaining value of stock repurchase programs authorization       $ 604,800,000    
Shares repurchased under authorized repurchase programs       21.2 12.9 7.2
Stock repurchases       $ 433,700,000 $ 245,834,000 $ 118,052,000
Shares withheld to pay taxes [Member]            
Class of Stock [Line Items]            
Stock repurchases       $ 9,000,000 $ 7,200,000 $ 9,600,000