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Stockholders' Equity (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Accelerated Share Repurchases [Line Items]                
Common stock, shares authorized (in shares) 150,000,000 150,000,000            
Common stock, par value (in dollars per share) $ 0.01 $ 0.01            
Common stock, shares outstanding (in shares) 79,465,393 83,814,809            
Shares available for grant (in shares) 3,491,118              
Authorized amount $ 212,500,000 $ 287,500,000 $ 499,700,000          
Remaining authorized repurchase amount 331,400,000              
Common stock, quarterly dividends declared (in dollars per share)         $ 0.13 $ 0.12 $ 0.11 $ 0.10
2012, 2013, 2014 and 2016 Share Repurchase Program [Member]                
Accelerated Share Repurchases [Line Items]                
Authorized amount (in shares) 1,350,000,000              
Accelerated Share Repurchase                
Accelerated Share Repurchases [Line Items]                
Authorized amount $ 212,500,000 $ 287,500,000 $ 499,700,000          
Purchases and retirement of common stock (in shares) 4,413,250 5,541,930 10,066,322          
December 2016 ASR Program                
Accelerated Share Repurchases [Line Items]                
Authorized amount (in shares) $ 300,000,000.0              
Forecast                
Accelerated Share Repurchases [Line Items]                
Common stock, quarterly dividends declared (in dollars per share)       $ 0.14