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Net Income per Share - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 13, 2020
Mar. 31, 2020
Mar. 31, 2019
Class of Stock [Line Items]      
Dilutive awards (in shares)   167,000 119,000
2016 Equity Plan      
Class of Stock [Line Items]      
Dilutive awards (in shares)   55,329  
Phantom Share Units (PSUs) | 2016 and 2017 Equity Plans      
Class of Stock [Line Items]      
Settlement period   5 years  
Phantom Share Units (PSUs) | 2016 Equity Plan      
Class of Stock [Line Items]      
Common stock shares contingently issuable (in shares)   43,580  
Restricted Stock Units (RSUs) | 2017 Equity Plan      
Class of Stock [Line Items]      
Common stock shares contingently issuable (in shares)   13,157  
Restricted Stock Units (RSUs) | 2017 Equity Plan, 2019 Award      
Class of Stock [Line Items]      
Restricted stock unit awards awarded (in shares) 420,303    
Stock compensation expense   $ 0.5  
Restricted Stock Units (RSUs) | 2017 Equity Plan, Additional 2019 Award      
Class of Stock [Line Items]      
Shares to be issued upon settlement of awards (in shares)   141,243  
Dilutive awards (in shares)   87,879  
Service-based RSUs | 2016 Equity Plan      
Class of Stock [Line Items]      
RSUs excluded from computation of earnings per share (in shares)   73,429  
Service-based RSUs | 2017 Equity Plan      
Class of Stock [Line Items]      
RSUs excluded from computation of earnings per share (in shares)   248,294  
Dilutive awards (in shares)   23,295  
Service-based RSUs | 2017 Equity Plan, 2019 Award      
Class of Stock [Line Items]      
Vesting period   3 years  
Performance and market-based RSUs | 2017 Equity Plan      
Class of Stock [Line Items]      
RSUs excluded from computation of earnings per share (in shares)   454,130  
Performance and market-based RSUs | 2017 Equity Plan, 2019 Award      
Class of Stock [Line Items]      
Vesting period   3 years