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Stock-Based Compensation - Performance Share Units (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 01, 2016
Dec. 31, 2016
USD ($)
$ / shares
shares
Stock-based compensation    
Stock-based compensation expense | $   $ 4.5
Employee stock-based compensation plan    
Stock-based compensation    
Total shares authorized   5,600,000
Shares available for future grants   5,200,000
Performance Share Units    
Stock-based compensation    
Ratio of common stock for each vested award   1
Number of Shares    
Granted (in shares)   321,612
Unvested as of end of period (in shares)   321,612
Weighted Average Grant Date Fair Value    
Granted (in dollars per share) | $ / shares   $ 29.11
Unvested as of end of period (in dollars per share) | $ / shares   $ 29.11
Stock-based compensation    
Period following vesting date for lapsing of transfer restrictions   6 months
Stock-based compensation expense | $   $ 2.6
Unrecognized compensation expense | $   $ 6.8
Period for recognition of unrecognized compensation expense   2 years 2 months 16 days
Performance Share Units | Tranche one    
Stock-based compensation    
Vesting (as a percent)   33.33%
Performance Share Units | Tranche two    
Stock-based compensation    
Vesting (as a percent)   33.33%
Performance Share Units | Tranche three    
Stock-based compensation    
Vesting (as a percent)   33.33%
Initial public offering | Performance Share Units    
Number of Shares    
Granted (in shares)   115,566
Long‑Term Incentive Plan    
Stock-based compensation    
Performance period 3 years  
Long‑Term Incentive Plan | Performance Share Units    
Number of Shares    
Granted (in shares)   206,046