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Employee and Non-Employee Benefit Plans (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
plan
shares
Sep. 30, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of active equity-based compensation plans | plan 2  
The 2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares approved (in shares) 1,500,000  
The Directors' Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares approved (in shares) 300,000  
Short-term Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
EDC, investments | $ $ 1,239  
STI Plan deferrals expensed | $ 1,489  
Short-term Incentive Plan | Accrued expenses    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
STI Plan deferrals expensed | $ 181  
Short-term Incentive Plan | Noncurrent liabilities    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
STI Plan deferrals expensed | $ $ 1,308  
Restricted Stock Units (RSUs), granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSUs outstanding (in shares) 118,525  
Participating securities (in shares) 112,865 331,375
Restricted Stock Units (RSUs), granted | The 2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (in shares) 334,389  
Restricted Stock Units (RSUs), granted | The Directors' Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (in shares) 81,558