Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Narrative (Details)

v3.20.1
Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 02, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance condition stock price hurdle 1 (in usd per share)   $ 10.50      
Performance condition stock price hurdle 2 (in usd per share)   12.25      
Performance condition stock price hurdle 3 (in usd per share)   14.00      
Performance condition stock price hurdle 4 (in usd per share)   15.75      
Performance condition stock price hurdle 5 (in usd per share)   17.50      
Valuation fair value, price per share, hurdle 1 (in usd per share)   5.93      
Valuation fair value, price per share, hurdle 2 (in usd per share)   5.28      
Valuation fair value, price per share, hurdle 3 (in usd per share)   4.70      
Valuation fair value, price per share, hurdle 4 (in usd per share)   4.20      
Valuation fair value, price per share, hurdle 5 (in usd per share)   $ 3.75      
Excess tax benefit   $ 0.1 $ 0.1 $ 0.5  
Year One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   3 years      
Year Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years      
Performance Share Awards (PSAs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance condition based on earnings before interest, taxes, depreciation and amortization   75.00%      
Performance condition based on cumulative free cash flow   25.00%      
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares accounted for as liability awards (in shares)   670,800 324,600    
Weighted-average grant date fair value of PSUs and RSUs (in dollars per share)   $ 7.39 $ 16.12    
Grant date fair value of RSUs     $ 2.1    
Restricted Stock Units (RSUs) | Year One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   1 year      
Award vesting percentage   33.33%      
Restricted Stock Units (RSUs) | Year Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   2 years      
Award vesting percentage   33.33%      
Restricted Stock Units (RSUs) | Year Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   3 years      
Award vesting percentage   33.33%      
Performance Share Units that may be settled in cash          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares accounted for as liability awards (in shares)   4,174 6,895    
Restricted Stock Units that may be settled in cash          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares accounted for as liability awards (in shares)   14,118 6,825    
Grant date fair value of RSUs     $ 1.8    
PSAs, PSUs and PBRSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares accounted for as liability awards (in shares)   868,300 1,102,500    
Weighted-average grant date fair value of PSUs and RSUs (in dollars per share)   $ 7.75 $ 13.94    
Grant date fair value of RSUs   $ 2.2      
Performance Shares, Performance Share Units and Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation expense   $ 5.2      
Weighted average period   3 years 2 months 12 days      
2016 LTIP Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares)   1,863,537      
2016 Directors' Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares)   188,351      
2016 Directors' Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   1 year      
Number of shares accounted for as liability awards (in shares)   260,273 241,730    
Common Stock | 2016 LTIP Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares)         5,500,000
Number of additional shares authorized (in shares) 2,100,000        
Common Stock | 2016 Directors' Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares)         600,000