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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share Based Compensation [Abstract]        
Option Award Vesting Period     3 years  
Share Based Compensation [Line Items]        
Share-based Compensation Expense in Period, Stock Option Awards $ 1,370 $ 872 $ 3,042 $ 2,847
Stock Options [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award 2,000   $ 2,000  
Weighted Average Remaining Life, Nonvested Stock Awards     1 year 4 months 24 days  
Restricted Stock LTIP Plan [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award 6,500   $ 6,500  
Weighted Average Remaining Life, Nonvested Stock Awards     2 years 1 month 6 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     40,382  
Restricted Stock Units (RSUs) LTIP Plan [Member]        
Share Based Compensation [Line Items]        
Unrecognized Share-based Compensation Expense, Nonvested Stock Award $ 900   $ 900  
Weighted Average Remaining Life, Nonvested Stock Awards     2 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     6,060