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Equity Incentive Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options, granted in period, gross (in shares) 16,185          
Options, granted in period (usd per share) $ 68.74          
General and Administrative Expense            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense $ 2.8   $ 2.7 $ 5.4 $ 5.6  
2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued (in shares) 58,192 104,734        
Restricted Stock | 2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares categorized as vesting           50.00%
Vesting period   3 years        
Fair value of shares issued $ 4.0 $ 3.3        
Shares categorized as performance based (percent)           50.00%
Restricted Stock | 2014 Plan | Share-based Payment Arrangement, Tranche One            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage   33.33%        
Restricted Stock | 2014 Plan | Share-based Payment Arrangement, Tranche Two            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage   33.33%        
Restricted Stock | 2014 Plan | Share-based Payment Arrangement, Tranche Three            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage   33.33%        
Performance Shares | 2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of shares issued   $ 1.1        
Grants in period (in shares)   17,454