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Stock-based Compensation - Restricted and Deferred Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 21, 2020
Jul. 07, 2020
Feb. 05, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Additional disclosures              
Compensation expense recognized         $ 7.1 $ 3.8 $ 3.5
Amount of compensation cost to be recognized         $ 10.9    
Period over which cost will be recognized         3 years    
Restricted stock unit              
Shares              
Non-vested at beginning of year (in shares)         778,317    
Granted (in shares)         385,893    
Dividend equivalents earned (in shares)         41,592    
Vested (in shares)         (117,641)    
Forfeited (in shares)         (71,123)    
Non-vested at end of year (in shares)         1,017,038 778,317  
Weighted-Average Grant Date Fair Value              
Non-vested at beginning of year (in dollars per share)         $ 27.27    
Granted (in dollars per share)         17.26    
Dividend equivalents earned (in dollars per share)         18.85    
Vested (in dollars per share)         21.38    
Forfeited (in dollars per share)         26.34    
Non-vested at end of year (in dollars per share)         $ 23.87 $ 27.27  
Additional disclosures              
Stock Issued During Period Shares Equity Instruments Other than Options Vested and Related Tax Benefit         106,589    
Deferred stock units              
Shares              
Non-vested at beginning of year (in shares)         21,261    
Granted (in shares)         33,419    
Dividend equivalents earned (in shares)         4,507    
Vested (in shares)         (24,924)    
Non-vested at end of year (in shares)         34,263 21,261  
Outstanding at end of year (in shares)         71,044    
Weighted-Average Grant Date Fair Value              
Non-vested at beginning of year (in dollars per share)         $ 26.78    
Granted (in dollars per share)         17.17    
Dividend equivalents earned (in dollars per share)         18.97    
Vested (in dollars per share)         25.68    
Non-vested at end of year (in dollars per share)         17.18 $ 26.78  
Outstanding at end of year (in dollars per share)         $ 24.34    
Performance based restricted stock unit              
Shares              
Granted (in shares)       15,724      
Additional disclosures              
Compensation expense recognized       $ 0.3      
Performance based restricted stock unit | Minimum              
Additional disclosures              
Vesting percentage (as a percent)       0.00%      
Performance based restricted stock unit | Maximum              
Shares              
Granted (in shares)       25,158      
Additional disclosures              
Vesting percentage (as a percent)       1.60%      
Stock option awards              
Additional disclosures              
Compensation expense recognized           $ 0.1 $ 0.2
2010 Equity Incentive Plan | Restricted stock unit | Members of management              
Shares              
Granted (in shares)     3,808        
Additional disclosures              
Compensation expense recognized     $ 0.1        
Period over which cost will be recognized     3 years        
Vesting percentage (as a percent)     1.00%        
2020 Equity Incentive Plan | Restricted stock unit | Members of management              
Shares              
Granted (in shares) 1,550            
Additional disclosures              
Period over which cost will be recognized 5 years            
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board              
Shares              
Granted (in shares)   380,535          
Additional disclosures              
Compensation expense recognized   $ 6.5          
Vesting percentage (as a percent)   1.00%          
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board | Minimum              
Additional disclosures              
Period over which cost will be recognized   1 year          
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board | Maximum              
Additional disclosures              
Period over which cost will be recognized   5 years          
2020 Equity Incentive Plan | Deferred stock units | Directors and Advisory Directors              
Shares              
Granted (in shares)   33,419          
Additional disclosures              
Compensation expense recognized   $ 0.6          
Period over which cost will be recognized   1 year          
Vesting percentage (as a percent)   1.00%