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Stock-Based Compensation - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
compensation_plan
Sep. 30, 2016
USD ($)
Jun. 27, 2017
shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of stock-based compensation plans | compensation_plan 2    
Allocated share-based compensation expense $ 5.4 $ 3.2  
Nonvested awards compensation costs not yet recognized $ 6.9    
2017 Equity Incentive Compensation Plan [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of shares authorized (in shares) | shares     3,400,000
2008 Equity Incentive Plan [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Nonvested awards, compensation costs not yet recognized, period for recognition 1 year 8 months 12 days