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Capital Stock Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 31, 2015
Aug. 20, 2014
Jan. 31, 2013
2013 Share Repurchase Program            
Equity, Class of Treasury Stock [Line Items]            
Number of shares authorized to be repurchased           1,500,000
Stock repurchased during period (shares)   771,000 729,000      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased         1,500,000  
Stock Repurchase program, Average Cost Per Share   $ 55.09        
2015 Share Repurchase Program [Member]            
Equity, Class of Treasury Stock [Line Items]            
Number of shares authorized to be repurchased       2,000,000    
Stock repurchased during period (shares) 852,000          
Stock repurchased during period (amount) $ 39,974,000          
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 1,148,000          
Stock Repurchase program, Average Cost Per Share $ 46.94