Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity Shareholders' Equity (Narrative) (Details)

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Shareholders' Equity Shareholders' Equity (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Equity [Abstract]  
Stock repurchase plan, authorized amount $ 500,000,000
Aggregate shares repurchased under stock repurchase plan 9,593,278
Stock repurchased to date, value $ 441,443,000