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Equity (Stock Repurchase Program) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Sep. 30, 2013
May 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Stock Repurchase Program        
Repurchase of common stock, authorized amount $ 50,000,000 $ 20,000,000    
Available repurchase of common stock, authorized amount 16,000,000   29,000,000  
Number of common stock shares repurchased     1.7 0.8
Amount of common stock shares repurchased     $ 21,000,000 $ 4,600,000
Average cost of shares repurchased (in dollars per share)     $ 12.35 $ 5.69