Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Narrative) (Details)

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Shareholders' Equity (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]    
Stock repurchase plan, authorized amount $ 700,000,000  
Aggregate shares repurchased under stock repurchase plan 20,992,740  
Stock repurchased to date, value $ 526,511,000  
Stock Repurchased During Period, Value $ 70,068,000 $ 15,000,000