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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options outstanding, beginning balance (shares)     1,718,000    
Options granted (shares) 0 0 172,000 750,000  
Options exercised (in shares)     (133,000)    
Options canceled/forfeited (shares)     (29,000)    
Options outstanding, ending balance (shares) 1,728,000   1,728,000   1,718,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Options outstanding, weighted average exercise price, beginning balance (usd per share)     $ 8.75    
Options granted, weighted average exercise price (usd per share) $ 0.00 $ 0.00 24.77 $ 12.85  
Options exercised, weighted average exercise price (usd per share)     3.83    
Options canceled/forfeited, weighted average exercise price (usd per share)     9.84    
Options outstanding, weighted average exercise price, ending balance (usd per share) $ 10.70   $ 10.70   $ 8.75
Weighted average remaining contractual life, in years     7 years 10 months 24 days   8 years 2 months 12 days
Stock Options and PSOs          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Stock-based compensation expense $ 700,000 $ 700,000 $ 2,000,000 $ 1,600,000  
PSOs | Vesting Tranche Four          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted awards that will vest 110.00%   110.00%    
PSOs | Vesting Tranche Five          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted awards that will vest 115.00%   115.00%    
2019 Performance Metric | PSOs          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options granted (shares)     172,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Options granted, weighted average exercise price (usd per share)     $ 24.77    
2019 Performance Metric | PSOs | Vesting Tranche Four          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options granted (shares)     40,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 50.00%   50.00%    
Percent of targeted awards that will vest 50.00%   50.00%    
2019 Performance Metric | PSOs | Vesting Tranche Six          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Share-based compensation options vested in period (shares)     0    
Percent of targeted awards that will vest 110.00%   110.00%    
2019 Performance Metric, Targeted Free Cash Flow Performance Metric | PSOs          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options granted (shares)     132,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 165.00%   165.00%    
Percent of targeted awards that will vest 150.00%   150.00%    
2019 Performance Metric, Targeted Free Cash Flow Performance Metric | PSOs | Vesting Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 100.00%   100.00%    
Percent of targeted awards that will vest 61.00%   61.00%    
2019 Performance Metric, Targeted Free Cash Flow Performance Metric | PSOs | Vesting Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 80.00%   80.00%    
Percent of targeted awards that will vest 48.00%   48.00%    
2019 Performance Metric, Targeted Free Cash Flow Performance Metric | PSOs | Vesting Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 80.00%   80.00%    
Share-based compensation options vested in period (shares)     0    
Stock-based compensation expense     $ 0    
2017 and 2018 Performance Metric | PSOs          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options granted (shares)     500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 150.00%   150.00%    
2017 and 2018 Performance Metric | PSOs | Vesting Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 100.00%   100.00%    
Percent of targeted awards that will vest 67.00%   67.00%    
2017 and 2018 Performance Metric | PSOs | Vesting Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 80.00%   80.00%    
Percent of targeted awards that will vest 53.00%   53.00%    
2017 and 2018 Performance Metric | PSOs | Vesting Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 80.00%   80.00%    
Share-based compensation options vested in period (shares)     0    
Stock-based compensation expense     $ 0    
2017 and 2018 Performance Metric | PSOs | Vesting Tranche Four          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 50.00%   50.00%    
2016 Performance Metric | PSOs          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options canceled/forfeited (shares)     (3,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]          
Percent of targeted performance metric 150.00%   150.00%    
Stock-based compensation expense         $ 1,000,000
Share-based compensation options vested (shares)     247,000    
Percent of achievement of award target performance metric 148.00%   148.00%