Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Stock-based compensation PBRSU valuation assumption (details) (Details)

v3.20.1
Stock-Based Compensation Stock-based compensation PBRSU valuation assumption (details) (Details) - PSAs, PSUs and PBRSUs - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Sep. 11, 2019
PBRSU      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant-date stock price (AFI closing stock price on September 11, 2019)     $ 7.43
share-based compensation PBRUs valuation assumption [Abstract]      
Risk-free rate of return 1.59%    
Expected volatility 41.45%    
Dividend yield 0.00%    
2016 LTIP Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant-date stock price (AFI closing stock price on September 11, 2019)   $ 15.41  
share-based compensation PBRUs valuation assumption [Abstract]      
Risk-free rate of return   1.60%  
Expected volatility   31.40%  
Dividend yield   0.00%