Quarterly report pursuant to Section 13 or 15(d)

Net Income Per Share - Anti-Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Details)

v3.8.0.1
Net Income Per Share - Anti-Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Details) - shares
shares in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 6,706 3,314
Common stock warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 0 20
Performance stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 743 700
Restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 525 6
Options to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 5,438 2,588