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Capital Stock - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 01, 2014
Incentive Plans        
Number of shares repurchased 0 4,300,000 4,800,000  
Cost of shares repurchased   $ 138,852 $ 164,634  
Cumulative number of shares repurchased under a share repurchase program 29,900,000      
Treasury stock, number of shares authorized to be repurchased 40,000,000.0      
Treasury stock, cumulative shares retired 20,000,000      
Cumulative cost of shares repurchased under a share repurchase program $ 388,400      
Treasury stock reissued 0      
Shares held as treasury stock (in shares) 9,892,680 9,892,680    
2014 Incentive Plan        
Incentive Plans        
Number of shares reserved for issuance       18,000,000
Number of shares available for issuance 17,100,000      
2014 Incentive Plan | Stock options | Maximum        
Incentive Plans        
Number of shares reserved for issuance       10,000,000