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Share-based Compensation - Restricted and Deferred Stock Units (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 07, 2020
Feb. 05, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Restricted stock unit            
Shares            
Non-vested at beginning of year (in shares)         778,317  
Granted (in shares)         384,343  
Dividend equivalents earned (in shares)         29,265  
Vested (in shares)         (117,641)  
Forfeited (in shares)         (66,132)  
Non-vested at end of year (in shares)     1,008,152   1,008,152  
Outstanding at end of year (in shares)     1,008,152   1,008,152  
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)         19.21  
Vested (in dollars per share)         21.38  
Forfeited (in dollars per share)         26.42  
Non-vested at end of year (in dollars per share)     $ 23.97   23.97  
Outstanding at end of year (in dollars per share)     $ 23.97   $ 23.97  
Deferred stock units            
Shares            
Non-vested at beginning of year (in shares)         21,261  
Granted (in shares)         33,419  
Dividend equivalents earned (in shares)         3,235  
Vested (in shares)         (24,066)  
Non-vested at end of year (in shares)     33,849   33,849  
Outstanding at end of year (in shares)     70,186   70,186  
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)         19.35  
Vested (in dollars per share)         25.95  
Non-vested at end of year (in dollars per share)     $ 17.17   17.17  
Outstanding at end of year (in dollars per share)     $ 24.41   $ 24.41  
Performance based restricted stock unit            
Shares            
Granted (in shares)     15,724      
Additional disclosures            
Compensation expense recognized     $ 300,000      
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)     160.00%      
RSUs and DSUs            
Additional disclosures            
Compensation expense recognized     $ 2,200,000 $ 1,200,000 $ 4,400,000 $ 3,100,000
Amount of compensation cost to be recognized     $ 13,400,000   $ 13,400,000  
Period over which cost will be recognized         3 years  
Employee stock purchase plan            
Additional disclosures            
Remaining shares available for issuance     18,711   18,711  
Stock option awards            
Additional disclosures            
Compensation expense recognized     $ 0 $ 0 $ 100,000
2010 Equity Incentive Plan | Restricted stock unit | Members of management            
Shares            
Granted (in shares)   3,808        
Additional disclosures            
Compensation expense recognized   $ 100,000        
Period over which cost will be recognized   3 years        
Vesting percentage (as a percent)   100.00%        
2020 Equity Incentive Plan            
Additional disclosures            
Remaining shares available for issuance     1,429,696   1,429,696  
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board            
Shares            
Granted (in shares) 380,535          
Additional disclosures            
Compensation expense recognized $ 6,500,000          
Vesting percentage (as a percent) 100.00%          
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 $ 600,000          
Period over which cost will be recognized 1 year          
Vesting percentage (as a percent) 100.00%