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Basis of Preparation - Narratives (Details)
$ / shares in Units, shares in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
location
$ / shares
Sep. 30, 2020
$ / shares
shares
Mar. 31, 2020
USD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 11, 2020
USD ($)
Nov. 06, 2017
USD ($)
Debt and Equity Securities, FV-NI              
Number of locations (location) | location 25            
Shares authorized for repurchase           $ 75,000,000  
Shares repurchased during the period (shares) | shares   760          
Weighted average share price of shares repurchased (per share) | $ / shares   $ 25.40          
Common stock repurchases [1]     $ 19,300,000        
Interest expense, net $ 2,000,000.0   7,200,000        
Income from continuing operations 25,600,000   2,100,000        
Scenario, Plan              
Debt and Equity Securities, FV-NI              
Interest expense, net 2,000,000.0            
Income from continuing operations $ 24,000,000.0            
Income from continued operations basic and diluted (usd per share) | $ / shares $ 0.04            
Treasury Stock              
Debt and Equity Securities, FV-NI              
Common stock repurchases [1]     19,300,000        
Convertible Notes, due 2024 | Convertible Debt              
Debt and Equity Securities, FV-NI              
Principal amount $ 258,800,000   258,800,000   $ 258,800,000   $ 258,800,000
Interest expense, net 600,000   $ 600,000        
Unamortized discount 0       34,800,000    
Unamortized debt issuance costs $ 3,600,000     $ 3,900,000 $ 3,100,000    
[1] Includes $19.3 in shares repurchased through our share repurchase program. On March 11, 2021, the share repurchase program expired with no further repurchases. Refer to Note 1, “Basis of Preparation” for further information.