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Stock-Based Compensation - Performance Share Units (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Stock-based compensation    
Stock-based compensation expense | $ $ 2.1 $ 2.1
Employee stock-based compensation plan    
Stock-based compensation    
Total shares authorized 5,600,000 5,600,000
Shares available for future grants 5,400,000 5,400,000
Performance Share Units    
Number of Shares    
Granted (in shares) 115,566 115,566
Unvested as of end of period (in shares) 115,566 115,566
Weighted Average Grant Date Fair Value    
Granted (in dollars per share) | $ / shares $ 24.41 $ 24.41
Unvested as of end of period (in dollars per share) | $ / shares $ 24.41 $ 24.41
Stock-based compensation    
Period following vesting date for lapsing of transfer restrictions 6 months 6 months
Stock-based compensation expense | $ $ 0.1 $ 0.1
Unrecognized compensation expense | $ $ 2.7 $ 2.7
Period for recognition of unrecognized compensation expense   2 years 9 months 29 days
Performance Share Units | Tranche one    
Stock-based compensation    
Vesting (as a percent) 33.33% 33.33%
Performance Share Units | Tranche two    
Stock-based compensation    
Vesting (as a percent) 33.33% 33.33%
Performance Share Units | Tranche three    
Stock-based compensation    
Vesting (as a percent) 33.33% 33.33%