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Stockholders' Equity, Preferred and Common Stock (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Common Stock [Abstract]      
Common stock, shares authorized to issue (in shares) 300,000,000 300,000,000  
Common stock, shares issued (in shares) 121,636,273 120,351,480  
Common stock, shares outstanding (in shares) 121,636,273 120,351,480  
Preferred Stock [Member]      
Preferred Stock [Abstract]      
Preferred stock, shares authorized (in shares) 15,000,000    
Preferred stock, shares outstanding (in shares) 0    
Series C Junior Participating Preferred Stock [Member]      
Preferred Stock [Abstract]      
Preferred stock, shares issued (in shares)   0  
Preferred stock, shares outstanding (in shares)   0  
Common Stock [Member]      
Common Stock [Abstract]      
Common stock, shares authorized to issue (in shares) 300,000,000 300,000,000  
Common stock, shares issued (in shares) 121,636,273 120,351,480  
Common stock, shares outstanding (in shares) 121,636,273 120,351,480  
Common shares reserved for future issuance (in shares) 14,703,837    
Number of shares issued for stock option exercises, vesting of restricted stock units, and ESPP purchases (in shares) 1,285,000 1,908,000 1,972,000
Net proceeds from stock option exercises, vesting of restricted stock units, and ESPP purchases $ 13.7 $ 24.9 $ 23.1